Verified. Doing plot->GetHistogram()->Sumw2(false); solved the problem.
I agree it does not really make sense in this context, but for a framework that handles both histograms and graphs, setting the default flag is pretty “natural”. Putting a protection is a good idea, but one needs to make sure it doesn’t break other histograms…
One could also make it clear in the documentation. I for one certainly did not imagine Sumw2 to be the culprit.
Anyway, thanks for the solution!
The fix should be at the graph painting time for the histogram used to draw the graph axis. I cannot imagine any case where one would like to have this empty histogram painted with errors… Therefore this histogram should be created without Sumw2 . Once fixed, there will be no need to update the documentation as it will behave as expected.
I just pushed a fix in the ROOT master. Your canvas has no extra line with that fix.
Thanks to have reported this problem.
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