When fitting a TGraph2D, do not use TGraph2D::GetHistogram, which makes an interpolation and fills the histogram, but just get the x/ymin-max values directly. This fixes ROOT-5972
When fitting a TGraph2D, do not use TGraph2D::GetHistogram, which makes an interpolation and fills the histogram, but just get the x/ymin-max values directly. This fixes ROOT-5972

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