void plot_track(){
  float x[23],xtrack[23],y[23],ytrack[23],z[23],ycor[23];
  ifstream track_file;
  track_file.open("junk2");
  for (int i=0;i<23;i++){
    track_file >> x[i];
    track_file >> xtrack[i];
    track_file >> y[i];
    track_file >> ytrack[i];
    track_file >> z[i];
    track_file >> ycor[i];
  }
  
  TH2F *hr13 = new TH2F("hr13","Track segments",
                        20,200,410,20,-15.,30);
  hr13->Draw();

  TGraph *g0=new TGraph(23,z,xtrack);
   
  g0->SetMarkerStyle(kFullCircle);
  g0->SetMarkerColor(1);
  g0->SetLineColor(1);
  g0->Draw("P");

  TGraph *g1=new TGraph(23,z,x);
   
  g1->SetMarkerStyle(kOpenTriangleUp);
  g1->SetMarkerColor(2);
  g1->SetLineColor(2);
  g1->Draw("P"); 

  TGraph *g2=new TGraph(23,z,ytrack);
   
  g2->SetMarkerStyle(kFullCircle);
  g2->SetMarkerColor(1);
  g2->SetLineColor(1);
  g2->Draw("P");

  TGraph *g3=new TGraph(23,z,y);
   
  g3->SetMarkerStyle(kOpenTriangleUp);
  g3->SetMarkerColor(2);
  g3->SetLineColor(2);
  g3->Draw("P");

  TGraph *g4=new TGraph(23,z,ycor);
   
  g4->SetMarkerStyle(kOpenCircle);
  g4->SetMarkerColor(4);
  g4->SetLineColor(4);
  g4->Draw("P");


}