Success! The line I needed was:
gcoeffs <-nls(y~(a/b)*exp(-(x-c)^2/(2*b^2)),start=list
(a=0.4,b=2,c=-10), trace=TRUE)
I also needed to provide good guesses for a, b and c. The attached
PNG should explain what I was going after, which is the line in the
center of that curve. I am sorry for my confusing and perhaps
incorrect usage of terminology.
Cheers,
Michael
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