plotHisto.C

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{
  gROOT->Reset();
  
  // Draw histos filled by Geant4 simulation 
  //   
  TFile f("testem4.root");
    
  TCanvas* c1 = new TCanvas("c1", "  ");
  c1->SetLogy(1);
  c1->cd();
  c1->Update();
  
  TH1D* hist = (TH1D*)f.Get("1");
  hist->Draw("HIST");    
}