Hi Rooters, I use a macro like the following: { Float_t diff[] = {0.00069*10000, 0.00085*10000, 0.00085*10000, 0.0008*10000}; Float_t res[] = {9.00012e-04*10000, 6.57761e-04*10000, 5.67896e-04*10000, 5.04990e-04*10000}; Float_t molt[] = {17300, 40000, 60000, 84210}; Float_t emolt[] = {0, 0, 0, 0}; c1 = new TCanvas(); TH1F *hr = c1->DrawFrame(-1,-4,100000,20); TGraphErrors *asparVsZtrue_gr1 = new TGraphErrors(4, molt, diff, emolt, res); asparVsZtrue_gr1->SetMarkerStyle(20); asparVsZtrue_gr1->Draw("P"); } Because of the negative value -4 in DrawFrame, TGraph draws an orizontal line at y=0 (see attachment). How could I evoid that? Regards, Giuseppe Lo Re.
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