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    6   TFile 
f = TFile(
"compt.root");
 
    7   TCanvas* 
c1 = 
new TCanvas(
"c1", 
"  ");
 
    9   TH1D* 
hist1 = (TH1D*)f.Get(
"1");
 
   12   TH1D* 
hist2 = (TH1D*)f.Get(
"2");
 
   15   TH1D* 
hist3 = (TH1D*)f.Get(
"3");
 
   18   TH1D* 
hist4 = (TH1D*)f.Get(
"4");