{
  TCanvas *c1 = new TCanvas("c1", "c1", 700, 500);
  c1->SetGridx();
  c1->SetGridy();
  TF1 *vavilov = new TF1("vavilov", "TMath::Vavilov(x, [0], [1])", -3, 11);
  vavilov->SetParameters(0.5, 0.);
  vavilov->SetLineColor(2);
  TF1 *vavilov1 = vavilov->DrawCopy("L");
  vavilov->SetParameters(0.3, 0.);
  vavilov->SetLineColor(3);
  TF1 *vavilov2 = vavilov->DrawCopy("LSAME");
  vavilov->SetParameters(0.2, 0.);
  vavilov->SetLineColor(4);
  TF1 *vavilov3 = vavilov->DrawCopy("LSAME");
  vavilov->SetParameters(0.1, 0.);
  vavilov->SetLineColor(6);
  TF1 *vavilov4 = vavilov->DrawCopy("LSAME");
  auto legend = new TLegend(0.5, 0.65, 0.85, 0.85);
  legend->AddEntry(vavilov1, "kappa = 0.5, beta2 = 0", "L");
  legend->AddEntry(vavilov2, "kappa = 0.3, beta2 = 0", "L");
  legend->AddEntry(vavilov3, "kappa = 0.2, beta2 = 0", "L");
  legend->AddEntry(vavilov4, "kappa = 0.1, beta2 = 0", "L");
  legend->Draw();
}