void drawdecay(TString filename="decay.root"){
  TFile *file = new TFile(filename);
  h1->SetFillColor(42);
  TCanvas *c1 = new TCanvas();
  h1->Draw();
  fteo->Draw("same");
  TCanvas *c2 = new TCanvas();
  c2->SetLogy();
  h1->Draw();
  fteo->Draw("same");
}