#include <TH2.h>
#include <TF1.h>
#include <TStyle.h>
#include <TCanvas.h>
#include "TProfile.h"
#include "TFile.h"
#include "TMatrixTSym.h"
#include "TGraphErrors.h"
#include "TGaxis.h"
#include "TLorentzVector.h"
#include "TMath.h"
#include "TVector.h"
#include "TStyle.h"
#include "TText.h"
#include "TBenchmark.h"
#include <iostream>
#include <fstream>
#include <string>
#include "TFile.h"
#include "TTree.h"
#include "THStack.h"
#include <TSQLServer.h>
#include <TSQLResult.h>
#include <TSQLRow.h>

int main(){

   double en[100000],den[100000],cr[100000],dcr[100000];
   int nrun = 0;
   ifstream stream("sample.dat");
   while(stream.eof()==0){
	stream >> en[nrun] >> den[nrun] >> cr[nrun] >> dcr[nrun];
	if(stream.eof()==1)break;
        nrun++;
   }
   TCanvas *s = new TCanvas();
   TH1F *frd  = s->DrawFrame(en[0]-10,-100.,en[nrun-1]+10,10000.);
   frd->SetXTitle("");
   frd->SetYTitle("");

   TGraphErrors *Cross  = new TGraphErrors(nrun,en,cr,den,dcr);
   Cross->SetMarkerColor(2);
   Cross->SetMarkerStyle(20);
   Cross->SetLineColor(2);
   Cross->SetLineWidth(2.);
   Cross->SetTitle("");
   Cross->Draw("P");
  
   return 1;
}