{
 gROOT->Reset();

  TCanvas *c1 = new TCanvas("c1","A Simple Graph
Example",200,10,700,500);

  const int colNum = 5;
  int palette[colNum];

  float green,red,blue;
  for (i=0;i<colNum;i++) 
  {
    switch(i)
    {
    case 0:  red=1.0;green=1.0;blue=1.0;break; // no chip read
    case 1:  red=1.0;green=0.0;blue=0.0;break; // no global register working
    case 2:  red=1.0;green=0.5;blue=0.5;break; // global register working
    case 3:  red=1.0;green=1.0;blue=0.0;break; // 1 col
    case 4:  red=1.0;green=0.5;blue=0.0;break; // 2
    case 5:  red=1.0;green=1.0;blue=0.5;break; // 3
    case 6:  red=0.0;green=1.0;blue=0.0;break; // 6
    case 7:  red=0.0;green=0.5;blue=0.0;break; // 7
    default: ;
    }
	
    TColor *color = new TColor(250+i,red,green,blue,"");
    palette[i] = 250+i;
    
  }
    
  gStyle->SetPalette(colNum,palette); 

  TF2 *F2 = new TF2("TF2","exp(-(x^2)-(y^2))",-3,3,-3,3);
  double levels[25];

  levels[0] = 0.0;
  levels[1] = 0.2;
  levels[2] = 0.9;

  F2->SetContour(3,levels);
   F2->Draw("surf2z");

   c1->Update();
}