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+\name{DFOP}
+\Rdversion{1.1}
+\alias{DFOP}
+\title{
+Dual First-Order in Parallel kinetics
+}
+\description{
+  Function describing decline from a defined starting value using the sum
+  of two exponential decline functions.
+}
+\usage{
+DFOP(t, parent.0, k1, k2, g)
+}
+\arguments{
+  \item{t}{ Time. }
+  \item{parent.0}{ Starting value for the response variable at time zero. }
+  \item{k1}{ First kinetic constant. }
+  \item{k2}{ Second kinetic constant. }
+  \item{g}{ Fraction of the starting value declining according to the
+    first kinetic constant.
+  }
+}
+\value{
+  The value of the response variable at time \code{t}.
+}
+\references{ 
+  FOCUS (2006) \dQuote{Guidance Document on Estimating Persistence and
+  Degradation Kinetics from Environmental Fate Studies on Pesticides in EU
+  Registration} Report of the FOCUS Work Group on Degradation Kinetics,
+  EC Document Reference Sanco/10058/2005 version 2.0, 434 pp,
+  \url{http://focus.jrc.ec.europa.eu/dk} 
+}
+\author{ Johannes Ranke }
+\examples{
+  \dontrun{plot(function(x) DFOP(x, 100, 5, 0.5, 0.3), 0, 4, ylim=c(0,100))}
+}
+\keyword{ manip }