Hello, it looks like ROOT calculates fTsumwx (and hence Mean of a histogram) in TH1 incorrectly. But if you perform your_histogram->GetXaxis()->SetRange(a,b); after the filling (or "zoom" by hands) it works correctly. It looks likes in the first case it is not used the center of bin when fTsumwx is calculated. Best regards, Andrei.
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