#include "Riostream.h"
void rt1()
{
   TString dir = gSystem->UnixPathName(__FILE__);
   dir.ReplaceAll("rt1.C","");
   dir.ReplaceAll("/./","/");
   ifstream in;
   in.open(Form("%sq18.txt",dir.Data()));
   Float_t x,y;
   Int_t nlines = 0;
   TCanvas *c1 = new TCanvas("c1","c1",600,400);
   TH1F *he = new TH1F("he","Distribution drawn with error bars (option E1)  ",100,-150,150);
   
   while (1) {
      in >> x >> y;
      if (!in.good()) break;
      if (nlines < 350000) printf("x=%8f, y=%8f\n",x,y);
 nlines++;     
 he->Fill(x,(y/1.80E-08)*100);     
   }
   gStyle->SetEndErrorSize(3);
   gStyle->SetErrorX(1.);
   he->SetMarkerStyle(20);
gPad->Update();
gPad->GetFrame()->GetY2();
   he->Draw("*");
gPad->Update();
gPad->GetFrame()->GetY2();
   return c1;
}