void event_size(){

  gROOT->Reset();
  gROOT->SetStyle("Plain");
  
  gROOT->ForceStyle();
  
  gStyle->SetOptStat(0);
  gStyle->SetOptFit(0);
  
  gStyle->SetTitleX(0.1f);
  gStyle->SetTitleW(0.8f);
  
  gStyle->SetLineWidth(1.5);
  gStyle->SetTextSize(1.5);
  
  gStyle->SetTitleFont(132,"xy");
  gStyle->SetLabelFont(132,"xy");
  
  //  gStyle->SetLabelFont(62,"xy");
  
  //  gStyle->SetLabelSize(0.073,"xy");
  gStyle->SetLabelSize(0.05,"xy");
  gStyle->SetTitleSize(0.052,"xy");
  
  gStyle->SetTitleOffset(1.0,"x");
  gStyle->SetTitleOffset(1.2,"y");
  
  gStyle->SetTitleBorderSize(0);
  
  
  Double_t x[6] = {50, 100, 200, 300, 400, 500};
  
  Double_t ex[6];

  Double_t event_size[6]       =  {8.8,   9.74,  11.38,  13.01,  14.46,  15.92 };
  Double_t event_size_st[6]    =  {10.2, 11.03,  12.72,  14.14,  15.83,  17.0 };


  Double_t data_rate[6]       =  {0.104,  0.248,  0.572,  1.03,   1.54,  2.14 };
  Double_t data_rate_st[6]    =  {0.074,  0.158,  0.404,  0.68,   1.08,  1.53 };
  

  TGraph *gr_size     =  new TGraph(6, x, event_size);
  TGraph *gr_size_st  =  new TGraph(6, x, event_size_st);


  TGraph *gr_rate     =  new TGraph(6, x, data_rate);
  TGraph *gr_rate_st  =  new TGraph(6, x, data_rate_st);

  TCanvas *c1 = new TCanvas("c1","c1",200,10, 900, 500);
  
  c1->Divide(2,1,0,0);
  
  c1->cd(1);

  gPad->SetBottomMargin(0.19);
  gPad->SetTopMargin(0.1);
  gPad->SetLeftMargin(0.15);
  gPad->SetRightMargin(0.015);


  gPad->SetGrid(1);
  
  gr_size->SetMarkerStyle(20);
  gr_size->SetMarkerSize(0.9);
  gr_size->SetMarkerColor(2);
  //  gr_size->SetMaximum(25);
  gr_size->GetXaxis()->SetRangeUser(0.,600);
  gr_size->GetYaxis()->SetRangeUser(0.,30);

  //  TF1 *f1 = new TF1("f1","[0]*x");
  //  gr_spring->Fit("f1");
  gr_size->Draw("APL");

  gr_size->SetTitle("Event Size");

  gr_size->GetXaxis()->SetTitle("Current  (nA)");
  gr_size->GetYaxis()->SetTitle("Event size  (kB)");

  gr_size_st->SetMarkerStyle(21);
  gr_size_st->SetMarkerSize(0.9);
  gr_size_st->SetMarkerColor(4);
  gr_size_st->SetMaximum(170);
  
  gr_size_st->Draw("plsame");
  
  leg = new TLegend(0.2,0.65,0.65,0.85);
  leg->SetFillColor(0);
  leg->SetTextSize(0.03);

  leg->AddEntry(gr_size,"New FCAL & BCAL ","p");
  leg->AddEntry(gr_size_st,"New FCAL & BCAL & ST","p");
  leg->Draw();

  c1->cd(2);

  gPad->SetBottomMargin(0.19);
  gPad->SetTopMargin(0.1);
  gPad->SetLeftMargin(0.15);
  gPad->SetRightMargin(0.015);
  gPad->SetGrid(1);

  gr_rate->GetXaxis()->SetRangeUser(0.,600.);
  gr_rate->GetYaxis()->SetRangeUser(0.,3.);

  gr_rate->SetMarkerStyle(20);
  gr_rate->SetMarkerSize(0.9);
  gr_rate->SetMarkerColor(2);
  gr_rate->SetTitle("Data Rate");
  gr_rate->Draw("APL");

  gr_rate_st->SetMarkerStyle(21);
  gr_rate_st->SetMarkerSize(0.9);
  gr_rate_st->SetMarkerColor(4);
  gr_rate_st->Draw("PLsame");

  gr_rate->GetYaxis()->SetTitle("Data Rate  (GB/sec)");
  gr_rate->GetXaxis()->SetTitle("Current  (nA)");


}