{
   auto hs = new THStack("hs","");
   auto h1 = new TH1F("h1","test hstack",10,-4,4);
   h1->FillRandom("gaus",20000);
   h1->SetFillColor(kRed);
   hs->Add(h1);
   auto h2 = new TH1F("h2","test hstack",10,-4,4);
   h2->FillRandom("gaus",15000);
   h2->SetFillColor(kBlue);
   hs->Add(h2);
   auto h3 = new TH1F("h3","test hstack",10,-4,4);
   h3->FillRandom("gaus",10000);
   h3->SetFillColor(kGreen);
   hs->Add(h3);
   auto cs = new TCanvas("cs","cs",10,10,700,900);
   TText T; T.SetTextFont(42); T.SetTextAlign(21);
   cs->Divide(2,2);
   cs->cd(1); hs->Draw(); T.DrawTextNDC(.5,.95,"Default drawing option");
   cs->cd(2); hs->Draw("nostack"); T.DrawTextNDC(.5,.95,"Option \"nostack\"");
   cs->cd(3); hs->Draw("nostackb"); T.DrawTextNDC(.5,.95,"Option \"nostackb\"");
   cs->cd(4); hs->Draw("lego1"); T.DrawTextNDC(.5,.95,"Option \"lego1\"");
}