{
   TCanvas* c1 = new TCanvas("c1", "", 700, 500);

   TH1* h = new TH1F("h", "title", 100, -10, 10); 

   for(int i = 0; i<100000; i++) {
      float x = gRandom->Gaus(0, 3);
      h->Fill(x);
   }

   h->Draw();
}