{


  //---------------------------------------------------------------------------------- Data_Set-A -------------------------------------------------------------------------------------------
   Int_t n_3 = 4;

   //Double_t x_3[4]  = {33.347, 32.859, 26.337, 23.311};
   Double_t x_3[4]  = {77.245, 65.692, 54.140, 44.2840};
   Double_t y_3[4]  = {122.4, 121.1, 120.3, 119.1};

   Double_t ex_3[4] = {0, 0, 0,0};
   Double_t ey_3[4] = {0.02985, 0.02912, 0.04814, 0.2272};

   
   TGraphErrors *gau_tri = new TGraphErrors(n_3,x_3,y_3,ex_3,ey_3);
   gau_tri->SetTitle("Data_Set-A");
   gau_tri->SetMarkerColor(2);
   gau_tri->SetLineColor(2);
   gau_tri->SetLineWidth(1);
   gau_tri->SetMarkerSize(1.6);
   gau_tri->SetMarkerStyle(8);
   gau_tri->SetDrawOption("AP");



//---------------------------------------------------------------------------------- Data_Set-B ------------------------------------------------------------------------------------------


   Int_t n_23 = 6;

   Double_t x_23[6]  = {35, 40, 45, 50, 55, 60};
   Double_t y_23[6]  = {118.808, 119.300, 120.117, 120.362, 120.828, 121.054};

   TGraph *gau23 = new TGraph(n_23,x_23,y_23);
   gau23->SetTitle("Data_Set-B");

   gau23->SetLineStyle(9);
   gau23->SetLineWidth(1);
   gau23->SetLineColor(2);
   gau23->SetDrawOption("C");


   //---------------------------------------------------------------------------------- Data_Set-C -------------------------------------------------------------------------------------------
   Int_t n_31 = 4;

   Double_t x_31[4]  = {33.347, 32.859, 26.337, 23.311};
   Double_t y_31[4]  = {121.113, 121.25, 120.113, 119.119};


   
   TGraph *gau_tri1 = new TGraph(n_31,x_31,y_31);
   gau_tri1->SetTitle("Data_Set-C");

   gau_tri1->SetLineStyle(2);
   gau_tri1->SetLineWidth(1);
   gau_tri1->SetLineColor(2);
   gau_tri1->SetDrawOption("C");


   //---------------------------------------------------------------------------------- Data_Set-D --------------------------------------------------------------------------------------------------------------
   Int_t n_1 = 3;

   Double_t x_1[3]  = {70.7, 59.1, 47.5};
   Double_t y_1[3]  = {122.3, 120.8, 119.6};

   Double_t ex_1[3] = {0, 0, 0};
   Double_t ey_1[3] = {0.0536, 0.03264, 0.0569};

   
   TGraphErrors *gir = new TGraphErrors(n_1,x_1,y_1,ex_1,ey_1);
   gir->SetTitle("Data_Set-D");

   gir->SetMarkerColor(1);
   gir->SetLineColor(1);
   gir->SetMarkerSize(1.6);
   gir->SetLineWidth(1);
   gir->SetMarkerStyle(71);
   gir->SetDrawOption("AP");

// for Data set A & C, I dont want to join the lines between the markers, but want to have the error bars plotted

 TCanvas *c11 = new TCanvas("c11","c11_Paper",800,500);
 c11->cd();

 TMultiGraph *mg = new TMultiGraph();

 mg->Add(gau23);
 mg->Add(gau_tri);
 mg->Add(gau_tri1);


 mg->Add(gir);

 mg->GetXaxis()->SetLimits(0,90);
 //mg->GetYaxis()->SetLimits(100., 150.);
 mg->Draw("APL");
 //c11->BuildLegend();
 c11->Update();


}