optim and singularity

Thanks Berend, setting lower=c(0,0.01) seems to have solved the problem.  I
have a dataset with 200+ cropped fields with associated data and wanted to
generate each plot in a way that minimized the visual residuals between the
green squares and blue circles.  I have inserted a resulting plot so you can
see how your suggestion has helped me accomplish this end.

Eric

http://r.789695.n4.nabble.com/file/n3169658/Field__18_.png

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