I am extremely new to ROOT, and I have produced a 2d dE/dx histogram, and now I am trying to fit a curve in order to make cuts on the particles. I have tried to find a guide but all the manuals appear to be for the C++ version.
So far I’ve tried to go to the fit panel and entering an equation like this:
However, whenever I press fit, it spits out nonsense values for each of the parameters, and draws a group of red lines somewhere on the histogram. Is there any simple way for me to get an upper and lower bound for the curve in the photo?