Another overhaul of analytical solutions

Still in preparation for analytical solutions of coupled models

19 files changed, 359 insertions, 125 deletions

diff --git a/docs/404.html b/docs/404.html
index 12d9b275..c6da911d 100644
--- a/docs/404.html
+++ b/docs/404.html
@@ -71,7 +71,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="https://pkgdown.jrwb.de/mkin/index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/articles/index.html b/docs/articles/index.html
index 40f16c15..7091d4c9 100644
--- a/docs/articles/index.html
+++ b/docs/articles/index.html
@@ -71,7 +71,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/authors.html b/docs/authors.html
index 9bba91ac..bc170e49 100644
--- a/docs/authors.html
+++ b/docs/authors.html
@@ -71,7 +71,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/index.html b/docs/index.html
index 546f9143..5c4a0a9b 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -37,7 +37,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/news/index.html b/docs/news/index.html
index 07f733dd..bc69fd2d 100644
--- a/docs/news/index.html
+++ b/docs/news/index.html
@@ -71,7 +71,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -143,7 +143,9 @@
 <a href="#mkin-0-9-50-1-unreleased" class="anchor"></a>mkin 0.9.50.1 (unreleased)<small> Unreleased </small>
 </h1>
 <ul>
-<li>Support SFORB with formation fractions</li>
+<li><p>Support SFORB with formation fractions</p></li>
+<li><p>‘mkinmod’: Make ‘use_of_ff’ = “max” the default</p></li>
+<li><p>Implement analytical solutions for some coupled models, e.g. SFO-SFO, DFOP-SFO, SFORB-SFO</p></li>
 </ul>
 </div>
     <div id="mkin-0-9-49-11-2020-04-20" class="section level1">
diff --git a/docs/pkgdown.yml b/docs/pkgdown.yml
index 6489b012..32bcaa05 100644
--- a/docs/pkgdown.yml
+++ b/docs/pkgdown.yml
@@ -10,7 +10,7 @@ articles:
   NAFTA_examples: web_only/NAFTA_examples.html
   benchmarks: web_only/benchmarks.html
   compiled_models: web_only/compiled_models.html
-last_built: 2020-05-07T07:07Z
+last_built: 2020-05-07T20:11Z
 urls:
   reference: https://pkgdown.jrwb.de/mkin/reference
   article: https://pkgdown.jrwb.de/mkin/articles
diff --git a/docs/reference/DFOP.solution.html b/docs/reference/DFOP.solution.html
index 46e0cc91..84e33f9e 100644
--- a/docs/reference/DFOP.solution.html
+++ b/docs/reference/DFOP.solution.html
@@ -73,7 +73,7 @@ two exponential decline functions." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/reference/FOMC.solution.html b/docs/reference/FOMC.solution.html
index 6c1f5229..369398d5 100644
--- a/docs/reference/FOMC.solution.html
+++ b/docs/reference/FOMC.solution.html
@@ -73,7 +73,7 @@ a decreasing rate constant." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/reference/HS.solution.html b/docs/reference/HS.solution.html
index ad33d948..2684ee60 100644
--- a/docs/reference/HS.solution.html
+++ b/docs/reference/HS.solution.html
@@ -73,7 +73,7 @@ between them." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -152,6 +152,22 @@ between them.</p>
     <table class="ref-arguments">
     <colgroup><col class="name" /><col class="desc" /></colgroup>
     <tr>
+      <th>t</th>
+      <td><p>Time.</p></td>
+    </tr>
+    <tr>
+      <th>parent_0</th>
+      <td><p>Starting value for the response variable at time zero.</p></td>
+    </tr>
+    <tr>
+      <th>k1</th>
+      <td><p>First kinetic constant.</p></td>
+    </tr>
+    <tr>
+      <th>k2</th>
+      <td><p>Second kinetic constant.</p></td>
+    </tr>
+    <tr>
       <th>tb</th>
       <td><p>Break point. Before this time, exponential decline according to
 <code>k1</code> is calculated, after this time, exponential decline proceeds
@@ -159,6 +175,21 @@ according to <code>k2</code>.</p></td>
     </tr>
     </table>
 
+    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
+
+    <p>The value of the response variable at time <code>t</code>.</p>
+    <h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
+
+    <p>FOCUS (2006) &#8220;Guidance Document on Estimating Persistence
+  and Degradation Kinetics from Environmental Fate Studies on Pesticides in
+  EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  <a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a>
+FOCUS (2014) &#8220;Generic guidance for Estimating Persistence
+  and Degradation Kinetics from Environmental Fate Studies on Pesticides in
+  EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
+  Version 1.1, 18 December 2014
+  <a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a></p>
     <h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
 
     <div class='dont-index'><p>Other parent solutions: 
diff --git a/docs/reference/SFO.solution.html b/docs/reference/SFO.solution.html
index 93da04eb..9664deb3 100644
--- a/docs/reference/SFO.solution.html
+++ b/docs/reference/SFO.solution.html
@@ -72,7 +72,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
diff --git a/docs/reference/SFORB.solution.html b/docs/reference/SFORB.solution.html
index c9f1b471..504f209f 100644
--- a/docs/reference/SFORB.solution.html
+++ b/docs/reference/SFORB.solution.html
@@ -76,7 +76,7 @@ and no substance in the bound fraction." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -158,6 +158,14 @@ and no substance in the bound fraction.</p>
     <table class="ref-arguments">
     <colgroup><col class="name" /><col class="desc" /></colgroup>
     <tr>
+      <th>t</th>
+      <td><p>Time.</p></td>
+    </tr>
+    <tr>
+      <th>parent_0</th>
+      <td><p>Starting value for the response variable at time zero.</p></td>
+    </tr>
+    <tr>
       <th>k_12</th>
       <td><p>Kinetic constant describing transfer from free to bound.</p></td>
     </tr>
@@ -176,6 +184,18 @@ fraction.</p></td>
 
     <p>The value of the response variable, which is the sum of free and
   bound fractions at time <code>t</code>.</p>
+    <h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
+
+    <p>FOCUS (2006) &#8220;Guidance Document on Estimating Persistence
+  and Degradation Kinetics from Environmental Fate Studies on Pesticides in
+  EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  <a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a>
+FOCUS (2014) &#8220;Generic guidance for Estimating Persistence
+  and Degradation Kinetics from Environmental Fate Studies on Pesticides in
+  EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
+  Version 1.1, 18 December 2014
+  <a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a></p>
     <h2 class="hasAnchor" id="see-also"><a class="anchor" href="#see-also"></a>See also</h2>
 
     <div class='dont-index'><p>Other parent solutions: 
diff --git a/docs/reference/create_deg_func.html b/docs/reference/create_deg_func.html
new file mode 100644
index 00000000..e14857cc
--- /dev/null
+++ b/docs/reference/create_deg_func.html
@@ -0,0 +1,198 @@
+<!-- Generated by pkgdown: do not edit by hand -->
+<!DOCTYPE html>
+<html lang="en">
+  <head>
+  <meta charset="utf-8">
+<meta http-equiv="X-UA-Compatible" content="IE=edge">
+<meta name="viewport" content="width=device-width, initial-scale=1.0">
+
+<title>Create degradation functions for known analytical solutions — create_deg_func • mkin</title>
+
+
+<!-- jquery -->
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
+<!-- Bootstrap -->
+
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha256-bZLfwXAP04zRMK2BjiO8iu9pf4FbLqX6zitd+tIvLhE=" crossorigin="anonymous" />
+
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha256-nuL8/2cJ5NDSSwnKD8VqreErSWHtnEP9E7AySL+1ev4=" crossorigin="anonymous"></script>
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+<link rel="stylesheet" href="../bootstrap-toc.css">
+<script src="../bootstrap-toc.js"></script>
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+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css" integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk=" crossorigin="anonymous" />
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/v4-shims.min.css" integrity="sha256-wZjR52fzng1pJHwx4aV2AO3yyTOXrcDW7jBpJtTwVxw=" crossorigin="anonymous" />
+
+<!-- clipboard.js -->
+<script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.6/clipboard.min.js" integrity="sha256-inc5kl9MA1hkeYUt+EC3BhlIgyp/2jDIyBLS6k3UxPI=" crossorigin="anonymous"></script>
+
+<!-- headroom.js -->
+<script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/headroom.min.js" integrity="sha256-AsUX4SJE1+yuDu5+mAVzJbuYNPHj/WroHuZ8Ir/CkE0=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/jQuery.headroom.min.js" integrity="sha256-ZX/yNShbjqsohH1k95liqY9Gd8uOiE1S4vZc+9KQ1K4=" crossorigin="anonymous"></script>
+
+<!-- pkgdown -->
+<link href="../pkgdown.css" rel="stylesheet">
+<script src="../pkgdown.js"></script>
+
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+<meta property="og:title" content="Create degradation functions for known analytical solutions — create_deg_func" />
+<meta property="og:description" content="Create degradation functions for known analytical solutions" />
+
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+
+<!-- mathjax -->
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/MathJax.js" integrity="sha256-nvJJv9wWKEm88qvoQl9ekL2J+k/RWIsaSScxxlsrv8k=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.5/config/TeX-AMS-MML_HTMLorMML.js" integrity="sha256-84DKXVJXs0/F8OTMzX4UR909+jtl4G7SPypPavF+GfA=" crossorigin="anonymous"></script>
+
+<!--[if lt IE 9]>
+<script src="https://oss.maxcdn.com/html5shiv/3.7.3/html5shiv.min.js"></script>
+<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
+<![endif]-->
+
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+
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+  <body data-spy="scroll" data-target="#toc">
+    <div class="container template-reference-topic">
+      <header>
+      <div class="navbar navbar-default navbar-fixed-top" role="navigation">
+  <div class="container">
+    <div class="navbar-header">
+      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false">
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+        <a class="navbar-link" href="../index.html">mkin</a>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
+      </span>
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+
+    <div id="navbar" class="navbar-collapse collapse">
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+        <li>
+  <a href="../reference/index.html">Functions and data</a>
+</li>
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+    Articles
+     
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+  </a>
+  <ul class="dropdown-menu" role="menu">
+    <li>
+      <a href="../articles/mkin.html">Introduction to mkin</a>
+    </li>
+    <li>
+      <a href="../articles/FOCUS_D.html">Example evaluation of FOCUS Example Dataset D</a>
+    </li>
+    <li>
+      <a href="../articles/FOCUS_L.html">Example evaluation of FOCUS Laboratory Data L1 to L3</a>
+    </li>
+    <li>
+      <a href="../articles/web_only/FOCUS_Z.html">Example evaluation of FOCUS Example Dataset Z</a>
+    </li>
+    <li>
+      <a href="../articles/web_only/compiled_models.html">Performance benefit by using compiled model definitions in mkin</a>
+    </li>
+    <li>
+      <a href="../articles/twa.html">Calculation of time weighted average concentrations with mkin</a>
+    </li>
+    <li>
+      <a href="../articles/web_only/NAFTA_examples.html">Example evaluation of NAFTA SOP Attachment examples</a>
+    </li>
+  </ul>
+</li>
+<li>
+  <a href="../news/index.html">News</a>
+</li>
+      </ul>
+      <ul class="nav navbar-nav navbar-right">
+        <li>
+  <a href="http://github.com/jranke/mkin/">
+    <span class="fab fa fab fa-github fa-lg"></span>
+     
+  </a>
+</li>
+      </ul>
+      
+    </div><!--/.nav-collapse -->
+  </div><!--/.container -->
+</div><!--/.navbar -->
+
+      
+
+      </header>
+
+<div class="row">
+  <div class="col-md-9 contents">
+    <div class="page-header">
+    <h1>Create degradation functions for known analytical solutions</h1>
+    <small class="dont-index">Source: <a href='http://github.com/jranke/mkin/blob/master/R/create_deg_func.R'><code>R/create_deg_func.R</code></a></small>
+    <div class="hidden name"><code>create_deg_func.Rd</code></div>
+    </div>
+
+    <div class="ref-description">
+    <p>Create degradation functions for known analytical solutions</p>
+    </div>
+
+    <pre class="usage"><span class='fu'>create_deg_func</span>(<span class='no'>spec</span>, <span class='kw'>use_of_ff</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='st'>"min"</span>, <span class='st'>"max"</span>))</pre>
+
+    <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
+    <table class="ref-arguments">
+    <colgroup><col class="name" /><col class="desc" /></colgroup>
+    <tr>
+      <th>spec</th>
+      <td><p>List of model specifications as contained in mkinmod objects</p></td>
+    </tr>
+    <tr>
+      <th>use_of_ff</th>
+      <td><p>Minimum or maximum use of formation fractions</p></td>
+    </tr>
+    </table>
+
+    <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
+
+    <p>Degradation function to be attached to mkinmod objects</p>
+
+    <h2 class="hasAnchor" id="examples"><a class="anchor" href="#examples"></a>Examples</h2>
+    <pre class="examples"><div class='input'>
+<span class='no'>SFO_SFO</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinmod.html'>mkinmod</a></span>(
+  <span class='kw'>parent</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"SFO"</span>, <span class='st'>"m1"</span>),
+  <span class='kw'>m1</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"SFO"</span>))</div><div class='output co'>#&gt; <span class='message'>Successfully compiled differential equation model from auto-generated C code.</span></div><div class='input'><span class='no'>fit</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinfit.html'>mkinfit</a></span>(<span class='no'>SFO_SFO</span>, <span class='no'>FOCUS_2006_D</span>, <span class='kw'>quiet</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>)</div><div class='output co'>#&gt; <span class='warning'>Warning: Observations with value of zero were removed from the data</span></div></pre>
+  </div>
+  <div class="col-md-3 hidden-xs hidden-sm" id="pkgdown-sidebar">
+    <nav id="toc" data-toggle="toc" class="sticky-top">
+      <h2 data-toc-skip>Contents</h2>
+    </nav>
+  </div>
+</div>
+
+
+      <footer>
+      <div class="copyright">
+  <p>Developed by Johannes Ranke.</p>
+</div>
+
+<div class="pkgdown">
+  <p>Site built with <a href="https://pkgdown.r-lib.org/">pkgdown</a> 1.5.1.</p>
+</div>
+
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diff --git a/docs/reference/index.html b/docs/reference/index.html
index f77881fe..75820166 100644
--- a/docs/reference/index.html
+++ b/docs/reference/index.html
@@ -71,7 +71,7 @@
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -609,7 +609,7 @@ kinetic models fitted with mkinfit</p></td>
       </tr><tr>
         
         <td>
-          <p><code><a href="logistic.solution.html">logistic.solution()</a></code> <code><a href="logistic.solution.html">logistic.solution()</a></code> </p>
+          <p><code><a href="logistic.solution.html">logistic.solution()</a></code> </p>
         </td>
         <td><p>Logistic kinetics</p></td>
       </tr>
diff --git a/docs/reference/logistic.solution.html b/docs/reference/logistic.solution.html
index 9697d420..b0ec77b1 100644
--- a/docs/reference/logistic.solution.html
+++ b/docs/reference/logistic.solution.html
@@ -41,8 +41,6 @@
 
 <meta property="og:title" content="Logistic kinetics — logistic.solution" />
 <meta property="og:description" content="Function describing exponential decline from a defined starting value, with
-an increasing rate constant, supposedly caused by microbial growth
-Function describing exponential decline from a defined starting value, with
 an increasing rate constant, supposedly caused by microbial growth" />
 
 
@@ -75,7 +73,7 @@ an increasing rate constant, supposedly caused by microbial growth" />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -139,20 +137,16 @@ an increasing rate constant, supposedly caused by microbial growth" />
   <div class="col-md-9 contents">
     <div class="page-header">
     <h1>Logistic kinetics</h1>
-    <small class="dont-index">Source: <a href='http://github.com/jranke/mkin/blob/master/R/logistic.solution.R'><code>R/logistic.solution.R</code></a>, <a href='http://github.com/jranke/mkin/blob/master/R/parent_solutions.R'><code>R/parent_solutions.R</code></a></small>
+    <small class="dont-index">Source: <a href='http://github.com/jranke/mkin/blob/master/R/parent_solutions.R'><code>R/parent_solutions.R</code></a></small>
     <div class="hidden name"><code>logistic.solution.Rd</code></div>
     </div>
 
     <div class="ref-description">
     <p>Function describing exponential decline from a defined starting value, with
 an increasing rate constant, supposedly caused by microbial growth</p>
-<p>Function describing exponential decline from a defined starting value, with
-an increasing rate constant, supposedly caused by microbial growth</p>
     </div>
 
-    <pre class="usage"><span class='fu'>logistic.solution</span>(<span class='no'>t</span>, <span class='no'>parent_0</span>, <span class='no'>kmax</span>, <span class='no'>k0</span>, <span class='no'>r</span>)
-
-<span class='fu'>logistic.solution</span>(<span class='no'>t</span>, <span class='no'>parent_0</span>, <span class='no'>kmax</span>, <span class='no'>k0</span>, <span class='no'>r</span>)</pre>
+    <pre class="usage"><span class='fu'>logistic.solution</span>(<span class='no'>t</span>, <span class='no'>parent_0</span>, <span class='no'>kmax</span>, <span class='no'>k0</span>, <span class='no'>r</span>)</pre>
 
     <h2 class="hasAnchor" id="arguments"><a class="anchor" href="#arguments"></a>Arguments</h2>
     <table class="ref-arguments">
@@ -177,10 +171,6 @@ an increasing rate constant, supposedly caused by microbial growth</p>
       <th>r</th>
       <td><p>Growth rate of the increase in the rate constant.</p></td>
     </tr>
-    <tr>
-      <th>parent.0</th>
-      <td><p>Starting value for the response variable at time zero.</p></td>
-    </tr>
     </table>
 
     <h2 class="hasAnchor" id="value"><a class="anchor" href="#value"></a>Value</h2>
@@ -190,11 +180,14 @@ an increasing rate constant, supposedly caused by microbial growth</p>
 
     <p>The solution of the logistic model reduces to the
   <code><a href='SFO.solution.html'>SFO.solution</a></code> if <code>k0</code> is equal to <code>kmax</code>.</p>
-<p>The solution of the logistic model reduces to the
-  <code><a href='SFO.solution.html'>SFO.solution</a></code> if <code>k0</code> is equal to <code>kmax</code>.</p>
     <h2 class="hasAnchor" id="references"><a class="anchor" href="#references"></a>References</h2>
 
-    <p>FOCUS (2014) &#8220;Generic guidance for Estimating Persistence
+    <p>FOCUS (2006) &#8220;Guidance Document on Estimating Persistence
+  and Degradation Kinetics from Environmental Fate Studies on Pesticides in
+  EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  <a href='http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics'>http://esdac.jrc.ec.europa.eu/projects/degradation-kinetics</a>
+FOCUS (2014) &#8220;Generic guidance for Estimating Persistence
   and Degradation Kinetics from Environmental Fate Studies on Pesticides in
   EU Registration&#8221; Report of the FOCUS Work Group on Degradation Kinetics,
   Version 1.1, 18 December 2014
@@ -248,44 +241,6 @@ an increasing rate constant, supposedly caused by microbial growth</p>
 #&gt; r          1.1821120
 #&gt; sigma      7.3256566</div><div class='input'>  <span class='fu'><a href='endpoints.html'>endpoints</a></span>(<span class='no'>m</span>)$<span class='no'>distimes</span></div><div class='output co'>#&gt;            DT50     DT90  DT50_k0 DT50_kmax
 #&gt; parent 36.86533 62.41511 4297.853  10.83349</div><div class='input'>
-
-  <span class='co'># Reproduce the plot on page 57 of FOCUS (2014)</span>
-  <span class='fu'><a href='https://rdrr.io/r/base/plot.html'>plot</a></span>(<span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'>logistic.solution</span>(<span class='no'>x</span>, <span class='fl'>100</span>, <span class='fl'>0.08</span>, <span class='fl'>0.0001</span>, <span class='fl'>0.2</span>),
-       <span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>ylim</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>0</span>, <span class='fl'>100</span>),
-       <span class='kw'>xlab</span> <span class='kw'>=</span> <span class='st'>"Time"</span>, <span class='kw'>ylab</span> <span class='kw'>=</span> <span class='st'>"Residue"</span>)</div><div class='input'>  <span class='fu'><a href='https://rdrr.io/r/base/plot.html'>plot</a></span>(<span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'>logistic.solution</span>(<span class='no'>x</span>, <span class='fl'>100</span>, <span class='fl'>0.08</span>, <span class='fl'>0.0001</span>, <span class='fl'>0.4</span>),
-       <span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>add</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>, <span class='kw'>lty</span> <span class='kw'>=</span> <span class='fl'>2</span>, <span class='kw'>col</span> <span class='kw'>=</span> <span class='fl'>2</span>)</div><div class='input'>  <span class='fu'><a href='https://rdrr.io/r/base/plot.html'>plot</a></span>(<span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'>logistic.solution</span>(<span class='no'>x</span>, <span class='fl'>100</span>, <span class='fl'>0.08</span>, <span class='fl'>0.0001</span>, <span class='fl'>0.8</span>),
-       <span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>add</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>, <span class='kw'>lty</span> <span class='kw'>=</span> <span class='fl'>3</span>, <span class='kw'>col</span> <span class='kw'>=</span> <span class='fl'>3</span>)</div><div class='input'>  <span class='fu'><a href='https://rdrr.io/r/base/plot.html'>plot</a></span>(<span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'>logistic.solution</span>(<span class='no'>x</span>, <span class='fl'>100</span>, <span class='fl'>0.08</span>, <span class='fl'>0.001</span>, <span class='fl'>0.2</span>),
-       <span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>add</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>, <span class='kw'>lty</span> <span class='kw'>=</span> <span class='fl'>4</span>, <span class='kw'>col</span> <span class='kw'>=</span> <span class='fl'>4</span>)</div><div class='input'>  <span class='fu'><a href='https://rdrr.io/r/base/plot.html'>plot</a></span>(<span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'>logistic.solution</span>(<span class='no'>x</span>, <span class='fl'>100</span>, <span class='fl'>0.08</span>, <span class='fl'>0.08</span>, <span class='fl'>0.2</span>),
-       <span class='kw'>from</span> <span class='kw'>=</span> <span class='fl'>0</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>add</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>, <span class='kw'>lty</span> <span class='kw'>=</span> <span class='fl'>5</span>, <span class='kw'>col</span> <span class='kw'>=</span> <span class='fl'>5</span>)</div><div class='input'>  <span class='fu'><a href='https://rdrr.io/r/graphics/legend.html'>legend</a></span>(<span class='st'>"topright"</span>, <span class='kw'>inset</span> <span class='kw'>=</span> <span class='fl'>0.05</span>,
-         <span class='kw'>legend</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/paste.html'>paste0</a></span>(<span class='st'>"k0 = "</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>0.0001</span>, <span class='fl'>0.0001</span>, <span class='fl'>0.0001</span>, <span class='fl'>0.001</span>, <span class='fl'>0.08</span>),
-                         <span class='st'>", r = "</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>0.2</span>, <span class='fl'>0.4</span>, <span class='fl'>0.8</span>, <span class='fl'>0.2</span>, <span class='fl'>0.2</span>)),
-         <span class='kw'>lty</span> <span class='kw'>=</span> <span class='fl'>1</span>:<span class='fl'>5</span>, <span class='kw'>col</span> <span class='kw'>=</span> <span class='fl'>1</span>:<span class='fl'>5</span>)</div><div class='img'><img src='logistic.solution-3.png' alt='' width='700' height='433' /></div><div class='input'>
-  <span class='co'># Fit with synthetic data</span>
-  <span class='no'>logistic</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinmod.html'>mkinmod</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"logistic"</span>))
-
-  <span class='no'>sampling_times</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>0</span>, <span class='fl'>1</span>, <span class='fl'>3</span>, <span class='fl'>7</span>, <span class='fl'>14</span>, <span class='fl'>28</span>, <span class='fl'>60</span>, <span class='fl'>90</span>, <span class='fl'>120</span>)
-  <span class='no'>parms_logistic</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>kmax</span> <span class='kw'>=</span> <span class='fl'>0.08</span>, <span class='kw'>k0</span> <span class='kw'>=</span> <span class='fl'>0.0001</span>, <span class='kw'>r</span> <span class='kw'>=</span> <span class='fl'>0.2</span>)
-  <span class='no'>d_logistic</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinpredict.html'>mkinpredict</a></span>(<span class='no'>logistic</span>,
-    <span class='no'>parms_logistic</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fl'>100</span>),
-    <span class='no'>sampling_times</span>)
-  <span class='no'>d_2_1</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='add_err.html'>add_err</a></span>(<span class='no'>d_logistic</span>,
-    <span class='kw'>sdfunc</span> <span class='kw'>=</span> <span class='kw'>function</span>(<span class='no'>x</span>) <span class='fu'><a href='sigma_twocomp.html'>sigma_twocomp</a></span>(<span class='no'>x</span>, <span class='fl'>0.5</span>, <span class='fl'>0.07</span>),
-    <span class='kw'>n</span> <span class='kw'>=</span> <span class='fl'>1</span>, <span class='kw'>reps</span> <span class='kw'>=</span> <span class='fl'>2</span>, <span class='kw'>digits</span> <span class='kw'>=</span> <span class='fl'>5</span>, <span class='kw'>LOD</span> <span class='kw'>=</span> <span class='fl'>0.1</span>, <span class='kw'>seed</span> <span class='kw'>=</span> <span class='fl'>123456</span>)<span class='kw'>[[</span><span class='fl'>1</span>]]
-
-  <span class='no'>m</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinfit.html'>mkinfit</a></span>(<span class='st'>"logistic"</span>, <span class='no'>d_2_1</span>, <span class='kw'>quiet</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>)
-  <span class='fu'><a href='plot.mkinfit.html'>plot_sep</a></span>(<span class='no'>m</span>)</div><div class='img'><img src='logistic.solution-4.png' alt='' width='700' height='433' /></div><div class='input'>  <span class='fu'><a href='https://rdrr.io/r/base/summary.html'>summary</a></span>(<span class='no'>m</span>)$<span class='no'>bpar</span></div><div class='output co'>#&gt;              Estimate   se_notrans   t value       Pr(&gt;t)        Lower
-#&gt; parent_0 1.057896e+02 1.9023449703 55.610119 3.768361e-16 1.016451e+02
-#&gt; kmax     6.398190e-02 0.0143201031  4.467978 3.841829e-04 3.929235e-02
-#&gt; k0       1.612775e-04 0.0005866813  0.274898 3.940351e-01 5.846688e-08
-#&gt; r        2.263946e-01 0.1718110715  1.317695 1.061044e-01 4.335843e-02
-#&gt; sigma    5.332935e+00 0.9145907310  5.830952 4.036926e-05 3.340213e+00
-#&gt;                Upper
-#&gt; parent_0 109.9341588
-#&gt; kmax       0.1041853
-#&gt; k0         0.4448749
-#&gt; r          1.1821120
-#&gt; sigma      7.3256566</div><div class='input'>  <span class='fu'><a href='endpoints.html'>endpoints</a></span>(<span class='no'>m</span>)$<span class='no'>distimes</span></div><div class='output co'>#&gt;            DT50     DT90  DT50_k0 DT50_kmax
-#&gt; parent 36.86533 62.41511 4297.853  10.83349</div><div class='input'>
 </div></pre>
   </div>
   <div class="col-md-3 hidden-xs hidden-sm" id="pkgdown-sidebar">
diff --git a/docs/reference/mkinmod.html b/docs/reference/mkinmod.html
index d1204e2e..2f2e89d9 100644
--- a/docs/reference/mkinmod.html
+++ b/docs/reference/mkinmod.html
@@ -75,7 +75,7 @@ list of lists can be given in the speclist argument." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -152,7 +152,7 @@ list of lists can be given in the speclist argument.</p>
 
     <pre class="usage"><span class='fu'>mkinmod</span>(
   <span class='no'>...</span>,
-  <span class='kw'>use_of_ff</span> <span class='kw'>=</span> <span class='st'>"min"</span>,
+  <span class='kw'>use_of_ff</span> <span class='kw'>=</span> <span class='st'>"max"</span>,
   <span class='kw'>speclist</span> <span class='kw'>=</span> <span class='kw'>NULL</span>,
   <span class='kw'>quiet</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>,
   <span class='kw'>verbose</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>
@@ -252,15 +252,15 @@ in the FOCUS and NAFTA guidance documents are used.</p>
 <span class='no'>SFO_SFO</span> <span class='kw'>&lt;-</span> <span class='fu'>mkinmod</span>(
   <span class='kw'>parent</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"SFO"</span>, <span class='st'>"m1"</span>),
   <span class='kw'>m1</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"SFO"</span>), <span class='kw'>verbose</span> <span class='kw'>=</span> <span class='fl'>TRUE</span>)</div><div class='output co'>#&gt; Compilation argument:
-#&gt;  /usr/lib/R/bin/R CMD SHLIB file66a9718e919b.c 2&gt; file66a9718e919b.c.err.txt 
+#&gt;  /usr/lib/R/bin/R CMD SHLIB fileb6a4eaab60.c 2&gt; fileb6a4eaab60.c.err.txt 
 #&gt; Program source:
 #&gt;   1: #include &lt;R.h&gt;
 #&gt;   2: 
 #&gt;   3: 
 #&gt;   4: static double parms [3];
-#&gt;   5: #define k_parent_sink parms[0]
-#&gt;   6: #define k_parent_m1 parms[1]
-#&gt;   7: #define k_m1_sink parms[2]
+#&gt;   5: #define k_parent parms[0]
+#&gt;   6: #define f_parent_to_m1 parms[1]
+#&gt;   7: #define k_m1 parms[2]
 #&gt;   8: 
 #&gt;   9: void initpar(void (* odeparms)(int *, double *)) {
 #&gt;  10:     int N = 3;
@@ -270,8 +270,8 @@ in the FOCUS and NAFTA guidance documents are used.</p>
 #&gt;  14: 
 #&gt;  15: void func ( int * n, double * t, double * y, double * f, double * rpar, int * ipar ) {
 #&gt;  16: 
-#&gt;  17: f[0] = - k_parent_sink * y[0] - k_parent_m1 * y[0];
-#&gt;  18: f[1] = + k_parent_m1 * y[0] - k_m1_sink * y[1];
+#&gt;  17: f[0] = - k_parent * y[0];
+#&gt;  18: f[1] = + f_parent_to_m1 * k_parent * y[0] - k_m1 * y[1];
 #&gt;  19: }</div><div class='output co'>#&gt; <span class='message'>Successfully compiled differential equation model from auto-generated C code.</span></div><div class='input'>
 <span class='co'># If we have several parallel metabolites</span>
 <span class='co'># (compare tests/testthat/test_synthetic_data_for_UBA_2014.R)</span>
diff --git a/docs/reference/mkinpredict.html b/docs/reference/mkinpredict.html
index 689fb7c7..21c13156 100644
--- a/docs/reference/mkinpredict.html
+++ b/docs/reference/mkinpredict.html
@@ -74,7 +74,7 @@ kinetic parameters and initial values for the state variables." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.11</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -268,8 +268,29 @@ solver is used.</p></td>
     <pre class="examples"><div class='input'>
 <span class='no'>SFO</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinmod.html'>mkinmod</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"SFO"</span>))
 <span class='co'># Compare solution types</span>
-<span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
-      <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"analytical"</span>)</div><div class='output co'>#&gt; <span class='error'>Error in (function (t, parent_0, k) {    parent = parent_0 * exp(-k * t)})(t = 0:20, parent.0 = c(degradinol = 100), k = 0.3): unbenutztes Argument (parent.0 = 100)</span></div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+<span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+      <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"analytical"</span>)</div><div class='output co'>#&gt;    time  degradinol
+#&gt; 1     0 100.0000000
+#&gt; 2     1  74.0818221
+#&gt; 3     2  54.8811636
+#&gt; 4     3  40.6569660
+#&gt; 5     4  30.1194212
+#&gt; 6     5  22.3130160
+#&gt; 7     6  16.5298888
+#&gt; 8     7  12.2456428
+#&gt; 9     8   9.0717953
+#&gt; 10    9   6.7205513
+#&gt; 11   10   4.9787068
+#&gt; 12   11   3.6883167
+#&gt; 13   12   2.7323722
+#&gt; 14   13   2.0241911
+#&gt; 15   14   1.4995577
+#&gt; 16   15   1.1108997
+#&gt; 17   16   0.8229747
+#&gt; 18   17   0.6096747
+#&gt; 19   18   0.4516581
+#&gt; 20   19   0.3345965
+#&gt; 21   20   0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
       <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"deSolve"</span>)</div><div class='output co'>#&gt;    time  degradinol
 #&gt; 1     0 100.0000000
 #&gt; 2     1  74.0818221
@@ -291,7 +312,7 @@ solver is used.</p></td>
 #&gt; 18   17   0.6096747
 #&gt; 19   18   0.4516581
 #&gt; 20   19   0.3345965
-#&gt; 21   20   0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+#&gt; 21   20   0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
       <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"deSolve"</span>, <span class='kw'>use_compiled</span> <span class='kw'>=</span> <span class='fl'>FALSE</span>)</div><div class='output co'>#&gt;    time  degradinol
 #&gt; 1     0 100.0000000
 #&gt; 2     1  74.0818221
@@ -313,7 +334,7 @@ solver is used.</p></td>
 #&gt; 18   17   0.6096747
 #&gt; 19   18   0.4516581
 #&gt; 20   19   0.3345965
-#&gt; 21   20   0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+#&gt; 21   20   0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
       <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"eigen"</span>)</div><div class='output co'>#&gt;    time  degradinol
 #&gt; 1     0 100.0000000
 #&gt; 2     1  74.0818221
@@ -337,25 +358,26 @@ solver is used.</p></td>
 #&gt; 20   19   0.3345965
 #&gt; 21   20   0.2478752</div><div class='input'>
 <span class='co'># Compare integration methods to analytical solution</span>
-<span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
-      <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"analytical"</span>)[<span class='fl'>21</span>,]</div><div class='output co'>#&gt; <span class='error'>Error in (function (t, parent_0, k) {    parent = parent_0 * exp(-k * t)})(t = 0:20, parent.0 = c(degradinol = 100), k = 0.3): unbenutztes Argument (parent.0 = 100)</span></div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+<span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+      <span class='kw'>solution_type</span> <span class='kw'>=</span> <span class='st'>"analytical"</span>)[<span class='fl'>21</span>,]</div><div class='output co'>#&gt;    time degradinol
+#&gt; 21   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
       <span class='kw'>method</span> <span class='kw'>=</span> <span class='st'>"lsoda"</span>)[<span class='fl'>21</span>,]</div><div class='output co'>#&gt;    time degradinol
-#&gt; 21   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+#&gt; 21   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
       <span class='kw'>method</span> <span class='kw'>=</span> <span class='st'>"ode45"</span>)[<span class='fl'>21</span>,]</div><div class='output co'>#&gt;    time degradinol
-#&gt; 21   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
+#&gt; 21   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>), <span class='fl'>0</span>:<span class='fl'>20</span>,
       <span class='kw'>method</span> <span class='kw'>=</span> <span class='st'>"rk4"</span>)[<span class='fl'>21</span>,]</div><div class='output co'>#&gt;    time degradinol
 #&gt; 21   20  0.2480043</div><div class='input'><span class='co'># rk4 is not as precise here</span>
 
 <span class='co'># The number of output times used to make a lot of difference until the</span>
 <span class='co'># default for atol was adjusted</span>
-<span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>),
+<span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>),
       <span class='fu'><a href='https://rdrr.io/r/base/seq.html'>seq</a></span>(<span class='fl'>0</span>, <span class='fl'>20</span>, <span class='kw'>by</span> <span class='kw'>=</span> <span class='fl'>0.1</span>))[<span class='fl'>201</span>,]</div><div class='output co'>#&gt;     time degradinol
-#&gt; 201   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol_sink</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>),
+#&gt; 201   20  0.2478752</div><div class='input'><span class='fu'>mkinpredict</span>(<span class='no'>SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_degradinol</span> <span class='kw'>=</span> <span class='fl'>0.3</span>), <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>degradinol</span> <span class='kw'>=</span> <span class='fl'>100</span>),
       <span class='fu'><a href='https://rdrr.io/r/base/seq.html'>seq</a></span>(<span class='fl'>0</span>, <span class='fl'>20</span>, <span class='kw'>by</span> <span class='kw'>=</span> <span class='fl'>0.01</span>))[<span class='fl'>2001</span>,]</div><div class='output co'>#&gt;      time degradinol
 #&gt; 2001   20  0.2478752</div><div class='input'>
 <span class='co'># Check compiled model versions - they are faster than the eigenvalue based solutions!</span>
 <span class='no'>SFO_SFO</span> <span class='kw'>=</span> <span class='fu'><a href='mkinmod.html'>mkinmod</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/list.html'>list</a></span>(<span class='kw'>type</span> <span class='kw'>=</span> <span class='st'>"SFO"</span>, <span class='kw'>to</span> <span class='kw'>=</span> <span class='st'>"m1"</span>),
-                  <span class='kw'>m1</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/list.html'>list</a></span>(<span class='kw'>type</span> <span class='kw'>=</span> <span class='st'>"SFO"</span>))</div><div class='output co'>#&gt; <span class='message'>Successfully compiled differential equation model from auto-generated C code.</span></div><div class='input'><span class='kw'>if</span>(<span class='fu'><a href='https://rdrr.io/r/base/library.html'>require</a></span>(<span class='no'>rbenchmark</span>)) {
+                  <span class='kw'>m1</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/list.html'>list</a></span>(<span class='kw'>type</span> <span class='kw'>=</span> <span class='st'>"SFO"</span>), <span class='kw'>use_of_ff</span> <span class='kw'>=</span> <span class='st'>"min"</span>)</div><div class='output co'>#&gt; <span class='message'>Successfully compiled differential equation model from auto-generated C code.</span></div><div class='input'><span class='kw'>if</span>(<span class='fu'><a href='https://rdrr.io/r/base/library.html'>require</a></span>(<span class='no'>rbenchmark</span>)) {
   <span class='fu'><a href='https://rdrr.io/pkg/rbenchmark/man/benchmark.html'>benchmark</a></span>(
     <span class='kw'>eigen</span> <span class='kw'>=</span> <span class='fu'>mkinpredict</span>(<span class='no'>SFO_SFO</span>, <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent_m1</span> <span class='kw'>=</span> <span class='fl'>0.05</span>, <span class='kw'>k_parent_sink</span> <span class='kw'>=</span> <span class='fl'>0.1</span>, <span class='kw'>k_m1_sink</span> <span class='kw'>=</span> <span class='fl'>0.01</span>),
       <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fl'>100</span>, <span class='kw'>m1</span> <span class='kw'>=</span> <span class='fl'>0</span>), <span class='fu'><a href='https://rdrr.io/r/base/seq.html'>seq</a></span>(<span class='fl'>0</span>, <span class='fl'>20</span>, <span class='kw'>by</span> <span class='kw'>=</span> <span class='fl'>0.1</span>),
@@ -371,7 +393,7 @@ solver is used.</p></td>
 }</div><div class='output co'>#&gt; <span class='message'>Lade nötiges Paket: rbenchmark</span></div><div class='output co'>#&gt;               test replications elapsed relative user.self sys.self user.child
 #&gt; 3          deSolve           10   0.229   28.625     0.229        0          0
 #&gt; 2 deSolve_compiled           10   0.008    1.000     0.008        0          0
-#&gt; 1            eigen           10   0.025    3.125     0.026        0          0
+#&gt; 1            eigen           10   0.026    3.250     0.025        0          0
 #&gt;   sys.child
 #&gt; 3         0
 #&gt; 2         0
diff --git a/docs/reference/nlme-1.png b/docs/reference/nlme-1.png
index 68ccb43f..8db1f999 100644
--- a/docs/reference/nlme-1.png
+++ b/docs/reference/nlme-1.png
diff --git a/docs/reference/nlme.html b/docs/reference/nlme.html
index 70c6b63c..b92d2141 100644
--- a/docs/reference/nlme.html
+++ b/docs/reference/nlme.html
@@ -10,23 +10,27 @@
 
 
 <!-- jquery -->
-<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.4.1/jquery.min.js" integrity="sha256-CSXorXvZcTkaix6Yvo6HppcZGetbYMGWSFlBw8HfCJo=" crossorigin="anonymous"></script>
 <!-- Bootstrap -->
 
-<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha256-916EbMg70RQy9LHiGkXzG8hSg9EdNy97GazNG/aiY1w=" crossorigin="anonymous" />
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/css/bootstrap.min.css" integrity="sha256-bZLfwXAP04zRMK2BjiO8iu9pf4FbLqX6zitd+tIvLhE=" crossorigin="anonymous" />
 
-<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha256-U5ZEeKfGNOja007MMD3YBI0A3OSZOQbeG6z2f2Y0hu8=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.4.1/js/bootstrap.min.js" integrity="sha256-nuL8/2cJ5NDSSwnKD8VqreErSWHtnEP9E7AySL+1ev4=" crossorigin="anonymous"></script>
+
+<!-- bootstrap-toc -->
+<link rel="stylesheet" href="../bootstrap-toc.css">
+<script src="../bootstrap-toc.js"></script>
 
 <!-- Font Awesome icons -->
-<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.7.1/css/all.min.css" integrity="sha256-nAmazAk6vS34Xqo0BSrTb+abbtFlgsFK7NKSi6o7Y78=" crossorigin="anonymous" />
-<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.7.1/css/v4-shims.min.css" integrity="sha256-6qHlizsOWFskGlwVOKuns+D1nB6ssZrHQrNj1wGplHc=" crossorigin="anonymous" />
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/all.min.css" integrity="sha256-mmgLkCYLUQbXn0B1SRqzHar6dCnv9oZFPEC1g1cwlkk=" crossorigin="anonymous" />
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.12.1/css/v4-shims.min.css" integrity="sha256-wZjR52fzng1pJHwx4aV2AO3yyTOXrcDW7jBpJtTwVxw=" crossorigin="anonymous" />
 
 <!-- clipboard.js -->
-<script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.4/clipboard.min.js" integrity="sha256-FiZwavyI2V6+EXO1U+xzLG3IKldpiTFf3153ea9zikQ=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.6/clipboard.min.js" integrity="sha256-inc5kl9MA1hkeYUt+EC3BhlIgyp/2jDIyBLS6k3UxPI=" crossorigin="anonymous"></script>
 
 <!-- headroom.js -->
-<script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.9.4/headroom.min.js" integrity="sha256-DJFC1kqIhelURkuza0AvYal5RxMtpzLjFhsnVIeuk+U=" crossorigin="anonymous"></script>
-<script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.9.4/jQuery.headroom.min.js" integrity="sha256-ZX/yNShbjqsohH1k95liqY9Gd8uOiE1S4vZc+9KQ1K4=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/headroom.min.js" integrity="sha256-AsUX4SJE1+yuDu5+mAVzJbuYNPHj/WroHuZ8Ir/CkE0=" crossorigin="anonymous"></script>
+<script src="https://cdnjs.cloudflare.com/ajax/libs/headroom/0.11.0/jQuery.headroom.min.js" integrity="sha256-ZX/yNShbjqsohH1k95liqY9Gd8uOiE1S4vZc+9KQ1K4=" crossorigin="anonymous"></script>
 
 <!-- pkgdown -->
 <link href="../pkgdown.css" rel="stylesheet">
@@ -40,7 +44,6 @@
 an mmkin row object. An mmkin row object is essentially a list of mkinfit
 objects that have been obtained by fitting the same model to a list of
 datasets." />
-<meta name="twitter:card" content="summary" />
 
 
 
@@ -58,7 +61,7 @@ datasets." />
 
   </head>
 
-  <body>
+  <body data-spy="scroll" data-target="#toc">
     <div class="container template-reference-topic">
       <header>
       <div class="navbar navbar-default navbar-fixed-top" role="navigation">
@@ -72,7 +75,7 @@ datasets." />
       </button>
       <span class="navbar-brand">
         <a class="navbar-link" href="../index.html">mkin</a>
-        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.49.10</span>
+        <span class="version label label-default" data-toggle="tooltip" data-placement="bottom" title="Released version">0.9.50</span>
       </span>
     </div>
 
@@ -116,7 +119,12 @@ datasets." />
 </li>
       </ul>
       <ul class="nav navbar-nav navbar-right">
-        
+        <li>
+  <a href="http://github.com/jranke/mkin/">
+    <span class="fab fa fab fa-github fa-lg"></span>
+     
+  </a>
+</li>
       </ul>
       
     </div><!--/.nav-collapse -->
@@ -131,7 +139,7 @@ datasets." />
   <div class="col-md-9 contents">
     <div class="page-header">
     <h1>Helper functions to create nlme models from mmkin row objects</h1>
-    
+    <small class="dont-index">Source: <a href='http://github.com/jranke/mkin/blob/master/R/nlme.R'><code>R/nlme.R</code></a></small>
     <div class="hidden name"><code>nlme.Rd</code></div>
     </div>
 
@@ -177,15 +185,15 @@ datasets.</p>
     <pre class="examples"><div class='input'><span class='no'>sampling_times</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>0</span>, <span class='fl'>1</span>, <span class='fl'>3</span>, <span class='fl'>7</span>, <span class='fl'>14</span>, <span class='fl'>28</span>, <span class='fl'>60</span>, <span class='fl'>90</span>, <span class='fl'>120</span>)
 <span class='no'>m_SFO</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinmod.html'>mkinmod</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fu'><a href='mkinsub.html'>mkinsub</a></span>(<span class='st'>"SFO"</span>))
 <span class='no'>d_SFO_1</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinpredict.html'>mkinpredict</a></span>(<span class='no'>m_SFO</span>,
-  <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent_sink</span> <span class='kw'>=</span> <span class='fl'>0.1</span>),
+  <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent</span> <span class='kw'>=</span> <span class='fl'>0.1</span>),
   <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fl'>98</span>), <span class='no'>sampling_times</span>)
 <span class='no'>d_SFO_1_long</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkin_wide_to_long.html'>mkin_wide_to_long</a></span>(<span class='no'>d_SFO_1</span>, <span class='kw'>time</span> <span class='kw'>=</span> <span class='st'>"time"</span>)
 <span class='no'>d_SFO_2</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinpredict.html'>mkinpredict</a></span>(<span class='no'>m_SFO</span>,
-  <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent_sink</span> <span class='kw'>=</span> <span class='fl'>0.05</span>),
+  <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent</span> <span class='kw'>=</span> <span class='fl'>0.05</span>),
   <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fl'>102</span>), <span class='no'>sampling_times</span>)
 <span class='no'>d_SFO_2_long</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkin_wide_to_long.html'>mkin_wide_to_long</a></span>(<span class='no'>d_SFO_2</span>, <span class='kw'>time</span> <span class='kw'>=</span> <span class='st'>"time"</span>)
 <span class='no'>d_SFO_3</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkinpredict.html'>mkinpredict</a></span>(<span class='no'>m_SFO</span>,
-  <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent_sink</span> <span class='kw'>=</span> <span class='fl'>0.02</span>),
+  <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>k_parent</span> <span class='kw'>=</span> <span class='fl'>0.02</span>),
   <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='kw'>parent</span> <span class='kw'>=</span> <span class='fl'>103</span>), <span class='no'>sampling_times</span>)
 <span class='no'>d_SFO_3_long</span> <span class='kw'>&lt;-</span> <span class='fu'><a href='mkin_wide_to_long.html'>mkin_wide_to_long</a></span>(<span class='no'>d_SFO_3</span>, <span class='kw'>time</span> <span class='kw'>=</span> <span class='st'>"time"</span>)
 
@@ -214,42 +222,37 @@ datasets.</p>
 #&gt;   Model: value ~ nlme_f(name, time, parent_0, log_k_parent_sink) 
 #&gt;  Data: grouped_data 
 #&gt;        AIC      BIC    logLik
-#&gt;   298.2781 307.7372 -144.1391
+#&gt;   252.7798 262.1358 -121.3899
 #&gt; 
 #&gt; Random effects:
 #&gt;  Formula: list(parent_0 ~ 1, log_k_parent_sink ~ 1)
 #&gt;  Level: ds
 #&gt;  Structure: Diagonal
-#&gt;          parent_0 log_k_parent_sink Residual
-#&gt; StdDev: 0.9374733         0.7098105  3.83543
+#&gt;             parent_0 log_k_parent_sink Residual
+#&gt; StdDev: 0.0006768135         0.6800777 2.489397
 #&gt; 
 #&gt; Fixed effects: parent_0 + log_k_parent_sink ~ 1 
-#&gt;                       Value Std.Error DF  t-value p-value
-#&gt; parent_0          101.76838 1.1445444 45 88.91606       0
-#&gt; log_k_parent_sink  -3.05444 0.4195622 45 -7.28008       0
+#&gt;                       Value Std.Error DF   t-value p-value
+#&gt; parent_0          101.74884 0.6456014 44 157.60321       0
+#&gt; log_k_parent_sink  -3.05575 0.4015811 44  -7.60929       0
 #&gt;  Correlation: 
 #&gt;                   prnt_0
-#&gt; log_k_parent_sink 0.034 
+#&gt; log_k_parent_sink 0.026 
 #&gt; 
 #&gt; Standardized Within-Group Residuals:
 #&gt;        Min         Q1        Med         Q3        Max 
-#&gt; -2.6169360 -0.2185329  0.0574070  0.5720937  3.0459868 
+#&gt; -2.1317488 -0.6878121  0.0828385  0.8592270  2.9529864 
 #&gt; 
-#&gt; Number of Observations: 49
-#&gt; Number of Groups: 3 </div><div class='input'><span class='fu'><a href='https://rdrr.io/r/graphics/plot.html'>plot</a></span>(<span class='fu'><a href='https://rdrr.io/pkg/nlme/man/augPred.html'>augPred</a></span>(<span class='no'>m_nlme</span>, <span class='kw'>level</span> <span class='kw'>=</span> <span class='fl'>0</span>:<span class='fl'>1</span>), <span class='kw'>layout</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>3</span>, <span class='fl'>1</span>))</div><div class='img'><img src='nlme-1.png' alt='' width='700' height='433' /></div><div class='input'># augPred does not seem to work on fits with more than one state
+#&gt; Number of Observations: 48
+#&gt; Number of Groups: 3 </div><div class='input'><span class='fu'><a href='https://rdrr.io/r/base/plot.html'>plot</a></span>(<span class='fu'><a href='https://rdrr.io/pkg/nlme/man/augPred.html'>augPred</a></span>(<span class='no'>m_nlme</span>, <span class='kw'>level</span> <span class='kw'>=</span> <span class='fl'>0</span>:<span class='fl'>1</span>), <span class='kw'>layout</span> <span class='kw'>=</span> <span class='fu'><a href='https://rdrr.io/r/base/c.html'>c</a></span>(<span class='fl'>3</span>, <span class='fl'>1</span>))</div><div class='img'><img src='nlme-1.png' alt='' width='700' height='433' /></div><div class='input'># augPred does not seem to work on fits with more than one state
 # variable
 
 </div></pre>
   </div>
-  <div class="col-md-3 hidden-xs hidden-sm" id="sidebar">
-    <h2>Contents</h2>
-    <ul class="nav nav-pills nav-stacked">
-      <li><a href="#arguments">Arguments</a></li>
-      <li><a href="#value">Value</a></li>
-      <li><a href="#see-also">See also</a></li>
-      <li><a href="#examples">Examples</a></li>
-    </ul>
-
+  <div class="col-md-3 hidden-xs hidden-sm" id="pkgdown-sidebar">
+    <nav id="toc" data-toggle="toc" class="sticky-top">
+      <h2 data-toc-skip>Contents</h2>
+    </nav>
   </div>
 </div>
 
@@ -260,7 +263,7 @@ datasets.</p>
 </div>
 
 <div class="pkgdown">
-  <p>Site built with <a href="https://pkgdown.r-lib.org/">pkgdown</a> 1.4.1.</p>
+  <p>Site built with <a href="https://pkgdown.r-lib.org/">pkgdown</a> 1.5.1.</p>
 </div>
 
       </footer>
diff --git a/docs/sitemap.xml b/docs/sitemap.xml
index 5abcc894..81368436 100644
--- a/docs/sitemap.xml
+++ b/docs/sitemap.xml
@@ -61,6 +61,9 @@
     <loc>https://pkgdown.jrwb.de/mkin/reference/confint.mkinfit.html</loc>
   </url>
   <url>
+    <loc>https://pkgdown.jrwb.de/mkin/reference/create_deg_func.html</loc>
+  </url>
+  <url>
     <loc>https://pkgdown.jrwb.de/mkin/reference/endpoints.html</loc>
   </url>
   <url>