How to find Bin in which its content is 1/10 of its maximum?

Hi all,
I have a TH2D histogram, How can I find location of the X axis(or y axis) in which its content is 1/10 of the maximum of the TH2D histogram? Its distributions in x and y axises are symmetric. the maximuon value can be found through Double_t max=h2->GetMaximum();. But how to find the location of a specific bin content?

You need to loop over the bins

double val=0;
for(int i=1;i<=h->GetNbinsX();i++)
 for(int j=1;j<=h->GetNbinsY();j++)
val =h->GetBinContent(i,j)


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