void superimpose_realandMC()
{
  TFile *file0 = TFile::Open("CosPADistribution_realdataonly.root");
  TFile *file1 = TFile::Open("CosPADistribution_MCdataonly.root");
  // TFile *file2 = TFile::Open("pT_bin2.root");

  TCanvas *canvas1 = (TCanvas*)file0->Get("c");
  TCanvas *canvas2 = (TCanvas*)file1->Get("c");
  // TCanvas *canvas3 = (TCanvas*)file2->Get("c");
  // canvas1->ls();
  //canvas2->ls();
  for(int i=0 ;i<10;i++)
    { TH1F *h1 = dynamic_cast<TH1F*>(canvas1->GetListOfPrimitives("h_CosPAReal_ptbin[2]"));
      TH1F *h2 = dynamic_cast<TH1F*>(canvas2->GetListOfPrimitives("h_CosPAMC_ptbin[2]"));}
//TH1F *h3 = (TH1F*)canvas3->GetPrimitive("h_CosPAReal_ptbin[2]");

 TCanvas *c1 = new TCanvas();
 c1->Divide(2,2);

 c1->cd(1);
 h1->Draw("P");
 c1->cd(2);
 h2->Draw("P");
 // c1->cd(3);
 // h3->Draw();

}