Analysing 2D histograms from TTree

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I have multiple TTrees from which I create TH2F histograms. I would like to fit linear functions to the histograms. Is there a way of finding the r-squared value for a fit?

Please have a look at the documentation for TH1::Fit(), as that also explains how to fit other kinds of histograms. There are also examples in the forum, and a tutorial you can use as example. I hope this is enough. Cheers,

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