THStack without line at 0

[crgg]

Hi guys,
here a small script which should demonstrate the issue.
For the draw option “nostack” I receive the plot with a blue line at 0;
In case of the default draw the line only apears for the parts of the stack greater than 0.

Here it is mentioned that “0” as draw option should be used to remove the line.

Y-axis range when plotting with "same" option

When drawing a histogram with pos and neg values you can remove the “0” line by specifying the Draw option “0”. THStack is for histograms. The equivalent for graphs is the class TMultiGraph. see examples in the tutorials like $ROOTSYS/tutorials/graphs/multigraph.C Rene

Unfortunatelly this didn’t work.

So there are actually two problems:

1. how to get rid of the line at 0
2. combine 1. with the nostack draw option

Thanks for your help

Christian

{
  TH1F* th1 = new TH1F("th1","th1",5,0.5,5.5);
  th1->SetLineColor(1);
  th1->SetLineWidth(2);

  TH1F* th2 = new TH1F("th2","th2",5,0.5,5.5);
  th2->SetLineColor(2);
  th2->SetLineWidth(2);

  th1->Fill(1,1);
  th1->Fill(2,-1);
  th1->Fill(3,1);
  th1->Fill(4,-1);
  th1->Fill(5,1);

  th2->Fill(1,2);
  th2->Fill(2,-2);
  th2->Fill(3,2);
  th2->Fill(4,-2);
  th2->Fill(5,2);

  THStack* ths = new THStack();

  ths->Add(th1);
  ths->Add(th2);
  

  TCanvas* c =  new TCanvas("stackTest","stackTest",700,400);
  c->cd();
  ths->Draw("nostack");
  //ths->Draw("");

}