TH2D contour drawing problem

ROOT
21

actually the C++ version was wrong. There is several graphs in each contour. so it should be:

{
   TFile *f = new TFile("test.root");
   TH2D* h = (TH2D*)f->Get("sigp1clsf");

   Double_t c = TMath::NormQuantile(1-0.05);

   printf("Contour to be drawn: %g\n",c);
   h->SetContour(1, &c);
   h->Draw("CONT LIST");
   gPad->Update();

   TObjArray *contours = gROOT->GetListOfSpecials()->FindObject("contours");
   TList *list = (TList*)contours->At(0);
   TGraph *curv = (TGraph*)list->First();
   TGraph *gc;
   for (int j = 0; j < list->GetSize(); j++) {
      gc = (TGraph*)curv->Clone();
      gc->Draw("L");
      curv = (TGraph*)list->After(curv);
   }
}