{
  delete gRandom;
  gRandom = new TRandom(123456); // Setting the seed
  TH1F *gauss = new TH1F("gauss", "Gauss Distribution", 200, 0, 20) ;
  for(int i=0; i<100000; ++i) {
    double a=gRandom->Gaus(10, 2);
    gauss->Fill(a);
  }

  TF1 *f1 = new TF1("f1", "gaus",0,20); // Orismos tis synartisis fl
  f1->SetLineColor(2);

  gStyle->SetOptStat(0); // Kamia ektypwsi twn statistikwn toy istogrammatos
  gStyle->SetOptFit(0); // Kamia ektypwsi toy apotelesmatos tis prosarnoghs

  TCanvas *c1 = new TCanvas("c1", "Gauss", 700, 400);
  c1->SetGrid();
  c1->SetFillColor(42);
  c1->cd();
  gauss->Fit(f1,"","",4,16); // Prosarmogh istogrammatos stin fi apo to 4 ews to 16

  double  p0 = f1->GetParameter(0); //Diavasma tou apotelesmatwn tis prosarmogis
  double  p1 = f1->GetParameter(1) ;
  double  p2 = f1->GetParameter(2) ;
  double ep0 = f1->GetParError(0) ;
  double ep1 = f1->GetParError(1) ;
  double ep2 = f1->GetParError(2);

  char tit[256];
  txt = new TPaveText(0.6,0.6,0.89,0.89, "NDC");
  sprintf (tit, "#color[4]{ #font[42]{ Constant = %.1f #pm %.1f} }",p0, ep0);
  cout << tit << endl;
  txt->AddText(tit);
  sprintf (tit, "#color[4]{ #font[42]{     Mean = %.1f #pm %.1f} }",p1, ep1);
  txt->AddText(tit);
  sprintf (tit, "#color[4]{ #font[42]{   #sigma = %.1f #pm %.1f} }",p2, ep2);
  txt->AddText(tit);
  txt->SetFillColor(42) ;
  txt->Draw();
}