Hi Rene, Well I can try interactively as you said. I click on TCanvas::SetLogy option, it works. But in a macro with TCanvas I'm not really successful. Here is a simple code. May you show modify it? :) TCanvas c1; c1.Divide(2,1); c1.cd(1) c1.SetLogy(); h1->Draw(); //likewise for c1.cd(2) Thanks a lot, Tuan
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