{

 int N=225;

 double lamdaalpha[N];
 double lamdabeta[N];
 double khi2[N],k[N], I[N],J[N];

 ifstream f(Form("../2-chi2/val.txt"));// des données a partir d'un fichier txt
 
  TH2D *h = new TH2D("h","h",15,0.05,1.55,15,0.05,1.55);


  for(int i=0; i<N; i++){
    f>>k[i]>>I[i]>>J[i]>>lamdaalpha[i]>>lamdabeta[i]>>khi2[i];


    cout<<k[i]<<I[i]<<J[i]<<lamdaalpha[i]<<" "<<lamdabeta[i]<<"  "<<k[i]<<" "<<khi2[i]<<endl;

    h->Fill(lamdaalpha[i],lamdabeta[i],khi2[i]);//remplissage de hitogramme
 }

 TCanvas *c1=new TCanvas("c1","c1",800,600);
 c1->SetGridx();
 c1->SetGridy();
      

     Double_t contours[3];
	contours[0] = 0.5;
        contours[1] = 1.;
        contours[2] = 2.;


  h->GetXaxis()->SetTitle("#lambda_{#alpha}");
  h->GetYaxis()->SetTitle("#lambda_{#beta}");
  h ->SetContour(3, contours);


  h->Draw("CONT LIST"); 
  c1->Update();

 }