Return errorband from any fit #6
Description
RooFit offers the possibility to plot CL intervals around the nominal fit: https://root-forum.cern.ch/t/plotting-the-error-bands-of-the-fit-result/21014
It would be very useful to have the fit, the upper, and the lower band returned as TGraph. My use-case would be to extract the uncertainty on the fit maximum and FWHM from this.