plotHisto.C

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{
  gROOT->Reset();
  
  // Draw histos filled by Geant4 simulation 
  //   
  TFile f("run01.root");
  TCanvas* c1 = new TCanvas("c1", "  ");
  c1->Divide(3,1);

  TH1D* hist1 = (TH1D*)f.Get("1");
  c1->cd(1);
  hist1->Draw("HIST");
  gPad->SetLogy();
  
  TH1D* hist2 = (TH1D*)f.Get("2");
  c1->cd(2);
  hist2->Draw("HIST");
  gPad->SetLogy();
  
  TH1D* hist3 = (TH1D*)f.Get("3");
  c1->cd(3);
  hist3->Draw("HIST");
  gPad->SetLogy();
}