THstack with combined error bars

Dear fellow root-ers,

I have a THStack of TH1F that I draw stacked (think of summed background/signal predictions for comparison with data). Is there a way to draw “combined” error bands? When drawing with THStack.Draw(“HIST E3”) I get errors for each of the individua histograms in the stack, but I would like the combined error bars to be drawn for the top histogram (I guess I can manually add the errors, set them for the top histo and set to zero for the rest but would prefer a less “hacky” solution).



No, there is no way to combine the band. ou should do it an other way . May be adding the histograms ?