Draw stats box in a THStack

Hello,
drawing a THStack usually gives no Stats-box. Is there an easy way to draw the statistics for the sum of all drawn histograms?
At the moment I’m doing something like this (using v4.03/02)

THStack* hists=new THStack("res1","Residuals long side");
	TH1S* eca1=new TH1S("eca1","residuals endcapA inner layer",100,-.5,.5);eca1->SetFillColor(kRed);
	TH1S* eca2=new TH1S("eca2","residuals endcapA outer layer",100,-.5,.5);eca2->SetFillColor(kMagenta);
	TH1S* ecc1=new TH1S("ecc1","residuals endcapC inner layer",100,-.5,.5);ecc1->SetFillColor(kYellow);
	TH1S* ecc2=new TH1S("ecc2","residuals endcapC outer layer",100,-.5,.5);ecc2->SetFillColor(kGreen);
	TH1S* bar1=new TH1S("bar1","residuals barrel inner layer",100,-.5,.5);bar1->SetFillColor(kBlue);
	TH1S* bar2=new TH1S("bar2","residuals barrel outer layer",100,-.5,.5);bar2->SetFillColor(kCyan);

//t is a TTree
	t->Project("eca1","res1","PixelSCT==1 && BarrelEC==-2 && LayerDisc==0");
	t->Project("eca2","res1","PixelSCT==1 && BarrelEC==-2 && LayerDisc==2");
	t->Project("ecc1","res1","PixelSCT==1 && BarrelEC==2 && LayerDisc==0");
	t->Project("ecc2","res1","PixelSCT==1 && BarrelEC==2 && LayerDisc==2");
	t->Project("bar1","res1","PixelSCT==1 && BarrelEC==0 && LayerDisc==0");
	t->Project("bar2","res1","PixelSCT==1 && BarrelEC==0 && LayerDisc==2");
	hists->Add(eca1);
	hists->Add(eca2);
	hists->Add(ecc1);
	hists->Add(ecc2);
	hists->Add(bar1);
	hists->Add(bar2,"sameshist");
		
	canv->cd(1);
	hists->Draw();

where I add the last histogram with the “sameshist” option. This works somehow, although I don’t know why. It computes the sum of all entries in the THStack, but it draws the histograms with error bars, although I gave the option “hist”.
I’m puzzled…

Cheers,
Tobias

Hi Tobias,

Thanks for reporting the problem with “error bars” when the option "same"
is specified. This problem is now fixed in the CVS head.

Rene