i know to get a y value in TF1 is f1.Eval(x).
but how can i get the x value corresponding to a y point?
see class TF1
Double_t GetX(Double_t y, Double_t xmin=0, Double_t xmax=0) const;
http://root.cern.ch/root/htmldoc/TF1.html#TF1:GetX
Rene
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