void primjer(){
   TCanvas *time = new TCanvas("c1","mion" ,600,1000);
   time ->Divide(1,3);
   time ->cd(1);

   TH1F *h1 = new TH1F("h1","tdc kanal" ,4096,0,4096);
   ifstream in;
   Float_t t;
   Int_t nlines= 0;
   in.open("mion.txt", ios::in);
   while (1) {
      in >> t;
      if (!in.good()) break;
      h1->Fill(t);
      nlines++;
   }
   in.close();
   h1->Draw();

   TH1F *h2 = (TH1F*)h1->Rebin(40,"h2");
   TF1 fit1("fit1","[0]*TMath::Exp(-x/[1])");
   fit1.SetParameter(1,2);
   h2 -> Fit("fit1","RLE","" ,100,3500);
   time ->cd(2);
   h2->Draw();

   int nbins = h2->GetXaxis()->GetNbins();
   TH1F *h3= new TH1F("h3","vrijeme",nbins ,0,5);
   for (int i=1;i<=nbins;i++)
   {
      double y = h2->GetBinContent(i);
      double x = h2->GetXaxis()->GetBinCenter(i);
      double xnew = 0.00125*x;
      h3->Fill(xnew,y);
   }
   h3 -> Fit("fit1","RLE","" ,0.2,4.8);
   time ->cd(3);
   h3->Draw();
}