#include"TCanvas.h"
#include"TF1.h"
#include"TROOT.h"
#include"TMath.h"
#include"TGraph.h"
#include"TH2.h"

void enroot()

{
  
TCanvas* c1 = new TCanvas("c1","Graph");
c1->SetLogy();

 float x,y;

 TGraph *gr = new TGraph("encount.txt");

TF1 *f1 = new TF1("f1","([0]/(2*3.14*pow(103.0,2)))*(tgamma(4.5-[1])/(tgamma([1])*tgamma(4.5-2*[1])))*((x/103.)^([1]-2.0))*((1+(x/103.))^([1]-4.5))",0.05,250.);


 f1->SetParameters(1.E5,1.203);
 gr->Fit("f1");
 gr->SetMarkerStyle(7);
 gr->Draw("ap");
 
}