{
   auto c  = new TCanvas("c","c",0,0,300,300);
   auto f2 = new TF2("f2","0.1+(1-(x-2)*(x-2))*(1-(y-2)*(y-2))",0.999,3.002,0.999,3.002);
   f2->SetContour(99); gStyle->SetPalette(kLightTerrain);
   f2->Draw("surf2Z"); f2->SetTitle("kLightTerrain");
}