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...but no such a steep incline.  Ive tried using different self starting models as found under: apropos("^ss")       however I have not gotten them to work, or at least to fix the problem. Curves similar to mine look like these site index curves: http://www.extension.umn.edu/distribution/naturalresources/components/3473-13.html In the example from the nlrq help the lines of the median and the various quantiles all start from the same location, tha is basically (x=0, y=0) in the coodinate plane.  With my problem, the lines start to be drawn from various different positions ( the lines always star...