I am using TGraph2DErrors. And after performing 2D fitting with a lego2 as a draw option. I wondered if one can plot something like the relative difference between data and fit (so (data - fit)/fit) for the 2D point? Or maybe root provides already something useful?. As I find it rather hard to really judge it from the 2D plots.
…and that’s indeed a recurrent request, something we should address on the ROOT side, be it within the upcoming RHist interfaces. @moneta is there an obvious TH2 alternative that you’re aware of? Residuals from TFitResult maybe?