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diff --git a/pkg/R/SSLRC_mobility_classification.R b/pkg/R/SSLRC_mobility_classification.R
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--- a/pkg/R/SSLRC_mobility_classification.R
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-# Copyright (C) 2015  Johannes Ranke
-# Contact: jranke@uni-bremen.de
-# This file is part of the R package pfm
-
-# This program is free software: you can redistribute it and/or modify it under
-# the terms of the GNU General Public License as published by the Free Software
-# Foundation, either version 3 of the License, or (at your option) any later
-# version.
-
-# This program is distributed in the hope that it will be useful, but WITHOUT
-# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
-# FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
-# details.
-
-# You should have received a copy of the GNU General Public License along with
-# this program. If not, see <http://www.gnu.org/licenses/>
-
-#' Determine the SSLRC mobility classification for a chemical substance from its Koc
-#'
-#' This implements the method specified in the UK data requirements handbook and was 
-#' checked against the spreadsheet published on the CRC website
-#'
-#' @param Koc The sorption coefficient normalised to organic carbon in L/kg
-#' @return A list containing the classification and the percentage of the
-#'   compound transported per 10 mm drain water
-#' @export
-#' @author Johannes Ranke
-#' @examples
-#' SSLRC_mobility_classification(100)
-SSLRC_mobility_classification <- function(Koc)
-{
-  if (!is.numeric(Koc) | length(Koc) != 1) stop("Please give a single number")
-  result <- list("Non mobile", 0.01)
-  if (Koc < 4000) result <- list("Slightly mobile", 0.02)
-  if (Koc < 1000) result <- list("Slightly mobile", 0.5)
-  if (Koc < 500) result <- list("Moderately mobile", 0.7)
-  if (Koc < 75) result <- list("Mobile", 1.9)
-  if (Koc < 15) result <- list("Very mobile", 1.9)
-  names(result) <- c("Mobility classification", 
-                     "Percentage drained per mm of drain water")
-  return(result)
-}