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...input would be really helpful. If anyone wants a sample data set then I can email you one. Thanks for any input Rob Knell School of Biological Sciences Queen Mary, University of London 'Phone +44 (0)20 7882 7720 http://www.qmw.ac.uk/~ugbt794 http://www.mopane.org Here's the code: switchline<- function(X,Y,Intmin,Intmax,Intgap,Slopemin,Slopemax,Slopegap) { # X = unimodal variable (e.g. filename$bodysize) # Y = bimodal variable (e.g. filename$hornsize) # Intmin = Minimum switchline intercept # Slopemin = Minimum switchline slope #...