void mycolor(char* name="h_example"){
  //Set up the colours I wish to use:
  const Int_t ncol = 9;
  Int_t colors[ncol];
  TColor *col;
  Double_t dg=1.0/(1.0*(Double_t)ncol);
  //  TColor::InitializeColors();
  col->InitializeColors();
  Double_t grey=0.;
   for (Int_t i=0; i<ncol; i++) {
     colors[i]= i+100;
     col = gROOT->GetColor(colors[i]);
     col->SetRGB(grey, grey, grey);
     grey += dg;
   }
}