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Fit of TGraphErrors fails, Fit of TGraph without Errors works - ROOT - ROOT Forum
ROOT: tutorials/fit/fitLinear.C File Reference
TGraph
TGraphErrors and fit with associated error weights - ROOT - ROOT Forum
ROOT: TMultiGraph Class Reference
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TGraph Fit - ROOT - ROOT Forum
A graph is a graphics object made of two arrays X and Y, holding the x,y coordinates of n points. There are several graph classes; they are TGraph , TGraphErrors , TGraphAsymmErrors , and TMultiGraph