Is Sumw2 called when reading histograms from files?

ROOT
1

Have called TH1::SetDefaultSumw2 before.

Will Sumw2 be called when I get a histogram from TFile?

2

Try to print:
std::cout << SomeHisto->GetSumw2N() << std::endl;
and use:
if (!(SomeHisto->GetSumw2N() > 0)) SomeHisto->Sumw2(kTRUE);

3

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