The problem is even worst. See the the plots attached, produced with the commands root>TChain chain("h1") root>chain.Add("$SCRATCH_WEEK/*.root") root> TCanvs ... root> h1->Draw("Ncmul") root>c->cd(2) root>h1->Draw("Ncmul","Igen & 1 << 3") I took off some commands... See the scales of both plots, they are wrong. Some idea? Thanks. Luiz
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