void fa(){

  TH2F *kip = new TH2F("kip",NULL, 2, 0, 50, 2, 0, 250);
  kip->SetStats(kFALSE);

  TF1 *f1 = new TF1("f1","500/x", 0, 50);
  f1->SetLineWidth(2);
  f1->SetLineColor(2);

  TLine *l1 = new TLine(0, 200, 50, 200);
  l1->SetLineWidth(2);

  TLine *l2 = new TLine(40, 0, 40, 250);
  l2->SetLineWidth(2);
  
  TCanvas *c = new TCanvas("c","c", 700, 500);
  c->SetGrid();
  kip->Draw();
  f1->Draw("same");
  l1->Draw();
  l2->Draw();
}