On one plot I have four TGraphErrors objects to which I want to fit a complicated user defined TF1 function. When I change the parameters for the second fit and plot the graph I find that the first fit has changed. TGraphErrors does not have a DrawCopy method with which I could freeze the first fit. I don't want to instantiate four different versions of the fitting function and its macros. I don't know how to define a separate param array for each fit. Is there a simple way to solve this problem? I am using ROOT 3.02.07. Since I no longer subscribe to roottalk, please send a copy of your answer directly to me. Thanks. Art Poskanzer
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