Hi @Wile_E_Coyote Thank you for all the time you are spending for me. I replaced
t->Draw(what, cut1 && !cut2 && !cut3);
with
t->Draw(what);
but I also get an empty plot.
Anyway, running the macro, I see on the screen that ROOT fill the histogram (I see black point on the screen), but at the end, it replace the plot with an empty plot. Then I think it happens when ROOT run this line
henecdsubstringcutrelTHF->Draw("COLZ");
it looks like that when it run that line, it make a new empty histogram (but it doesn’t happen with TH1F plots, just with TH2F)