{
  TCanvas *c1 = new TCanvas();
  gROOT->ProcessLine(".L TurnOnFit.C");
  TFile *f = new TFile("histo.root");
  TH1F* to_all = (TH1F*)f->Get("to_all");
  to_all->Draw();
  TCanvas *c2 = new TCanvas();
  to_all->Draw();
  //TF1 *fit3 = new TF1("fit3",turnon_func,10.,18.,3);
  //fit3->SetParameters(13.0,1.0,0.75);
  //to_all->Fit("fit3");
}