draw_illustration_hist.cxx

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void draw_illustration_hist(){
  TFile *f = new TFile("../hadron_track/pion/pion.root");
  TTree *t = (TTree*)f->Get("n103");
  TCanvas *c1 = new TCanvas("c1","dE/dx distribution",10,10,800,642);
  t->Draw("dEdx_hit>>h(400, 0,3000)", "ptrk>0.802 & ptrk<0.803", "", 100000);
  TArrow *a1 = new TArrow(1040.5, 50., 1040.5, 5., 0.02, "|>");
  TArrow *a2 = new TArrow(1454.5, 50., 1454.5, 5., 0.02, "|>");
  TArrow *a3 = new TArrow(1578.7, 50., 1578.7, 5., 0.02, "|>");
  a1->Draw();
  a2->Draw();
  a3->Draw();
  c1->SaveAs("figs/hist_illustration.eps");
}