Update fit with Fit Panel

[Wile_E_Coyote]

Help for fit panel and next proccess

After clicking the “Fit” button in the “Fit Panel”, try (warning: the address of the function created by the “Fit Panel” will change each time one clicks the “Fit” button): { Double_t xmin = hspec->GetXaxis()->GetXmin(); Double_t xmax = hspec->GetXaxis()->GetXmax(); std::cout << "xmin = " << xmin << " , xmax = " << xmax << std::endl; // a "temporary function" (pointer changes when the "Fit" button is clicked) TF1 *f = hspec->GetFunction("PrevFitTMP"); // function created by Fit Panel …