void Test(){
const char *inputFile = "Test.txt";

  TCanvas *c1 = new TCanvas("c1","A Simple Graph Example",800,500);
//  c1->SetGrid();
//  c1->SetLogx();
//  c1->SetLogy(1);
  c1->SetTickx();
  c1->SetTicky();

  TMultiGraph *multigraph = new TMultiGraph();
  multigraph->GetXaxis()->SetTitle("X-axis");
  multigraph->GetYaxis()->SetTitle("Y-axis");
  
  TLegend *legend = new TLegend(0.7,0.155,0.85,0.25,NULL,"brNDC");

  TGraph *g1 = new TGraph(inputFile, "%lg %lg");
  g1->SetLineColor(3);

  TGraph *g2 = new TGraph(inputFile, "%lg %*lg %lg");
  g2->SetLineColor(2);

  multigraph->Add(g1,"L");
  multigraph->Add(g2,"L");
  multigraph->Draw("AP");

  legend->AddEntry(g1,"Sample-1","l");
  legend->AddEntry(g2,"Sample-2","l");
  legend->Draw();
  
   multigraph->GetXaxis()->SetLimits(50., 1800.);
   gPad->SetLogy(1);
   gPad->Modified(); gPad->Update();

c1->Print("Test.pdf");

}