void Lumi(){
   
   TFile *f1 = TFile::Open("2_Y_0190_PLT.root");
   TCanvas *c1 = (TCanvas*)f1->Get("c");
   TPad *p1 = (TPad*)c1->GetPrimitive("p2");
   TGraphAsymmErrors *g1 = (TGraphAsymmErrors*)p1->GetPrimitive("2_Y_0190");
   g1->GetYaxis()->SetLimits(0,0.5);
   g1->GetXaxis()->SetLimits(-0.5,0.5);
   //g1->SetMarkerStyle(kCircle); 
   g1->SetTitle("Y Plane scan, BCID 190//2017 XeXe,5.44 TeV");
   g1->SetMarkerColor(kRed);
   
   TFile *f2 = TFile::Open("2_Y_0190_HFOC.root");
   TCanvas *c2 = (TCanvas*)f2->Get("c");
   TPad *p2 = (TPad*)c2->GetPrimitive("p2");
   TGraphAsymmErrors *g2 = (TGraphAsymmErrors*)p2->GetPrimitive("2_Y_0190");
   g2->GetYaxis()->SetLimits(0,0.5);
   //g2->SetMarkerStyle(kOpenSquare);
   g2->SetTitle("CMS Preliminary");
   g2->SetMarkerColor(kBlue);
   g2->GetXaxis()->SetLimits(-0.5,0.5);
   
   TFile *f3 = TFile::Open("2_Y_0190_BCM1FPCVD.root");
   TCanvas *c3 = (TCanvas*)f3->Get("c");
   TPad *p3 = (TPad*)c3->GetPrimitive("p2");
   TGraphAsymmErrors *g3 = (TGraphAsymmErrors*)p3->GetPrimitive("2_Y_0190");
   //g3->SetLineColor(2);
   g3->GetYaxis()->SetLimits(0,0.5);
   g3->SetTitle("VdM Scan:Fill 6295");
   //g3->SetMarkerStyle(kFullSquare);
   g3->SetMarkerColor(kGreen);
   g3->GetXaxis()->SetLimits(-0.5,0.5); 

   auto C = new TCanvas();
   g1->Draw("");
   g2->Draw("*");
   g3->Draw("*");
}