plotHisto.C

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{
  gROOT->Reset();
  
  // Draw histos filled by Geant4 simulation 
  //   
  TFile f = TFile("water_100um.root");
  TCanvas* c1 = new TCanvas("c1", "  ");
  c1->SetLogy(0);
  c1->cd();
  c1->Update();
     
  TH1D* hist1 = (TH1D*)f.Get("1");
  hist1->Draw("HIST");
    
  TH1D* hist3 = (TH1D*)f.Get("3");
  hist3->Draw("HIST");
    
  TH1D* hist4 = (TH1D*)f.Get("4");
  hist4->Draw("HIST");
  
  TH1D* hist5 = (TH1D*)f.Get("5");
  hist5->Draw("HIST");          
}