void simple()
{
   
   TFile *f1 = new TFile("TestCAL_Co60_d5z3.root", "READ");
   TH1D *h1 = static_cast<TH1D*>(f1->Get("Edep"));

/*   TFile f2("TestCAL_Co60_d5z6.root");
   TH1D *h2 = static_cast<TH1D*>(f2.Get("Edep"));

   TFile f3("TestCAL_Co60_d5z9.root");
   TH1D *h3 = static_cast<TH1D*>(f3.Get("Edep"));   
*/

   h1->Draw();
/*   h2->Draw("same");
   h3->Draw("same");
*/
}