void thin_hist(void) {
   gStyle->SetFrameLineWidth(5);
   gStyle->SetHistLineWidth(5);
   TCanvas *c_thick_hist = new TCanvas("c_thick_hist", "c_thick_hist",
                                       1000, 700);
   TH1F *h1 = new TH1F("h1", "h1", 10, 0, 1);
   TH1F *h2 = new TH1F("h2", "h2", 10, 0, 1);
   h1->Fill(.3);
   h2->Fill(.7);
   h1->Draw();
   h2->Draw("e same");
   TCanvas *c_thin_hist = new TCanvas("c_thin_hist", "c_thin_hist", 100, 70);
   h1->Draw();
   h2->Draw("e same");
}