{
  //reading the input file
  TTree *T = new TTree("ntuple","data from ascii file");
  Long64_t nlines = T->ReadFile("input.dat","x:y:sect:dist");
   
  //create a canvas    
  TCanvas *fig1 = new TCanvas("fig1","Pareto Zone");

  //create both pads and orientate them
  int phi=10;  int theta=30;    
  TPad *pad1 = new TPad("pad1","",0,0,1,1); pad1->SetPhi(phi); pad1->SetTheta(theta);
  TPad *pad2 = new TPad("pad2","",0,0,1,1); pad2->SetPhi(phi); pad2->SetTheta(theta);
  pad2->SetFillStyle(4000); //will be transparent

  //First plot
  pad1->Draw(); pad1->cd();
  T->SetMarkerColor(2);
  T->Draw("sect:y:x");
  //Get the TH3 to change Z axis color
  TH3F *htemp = (TH3F*)gPad->GetPrimitive("htemp");
  htemp->SetTitle("");
  htemp->GetZaxis()->SetLabelColor(2); htemp->GetZaxis()->SetAxisColor(2); htemp->GetZaxis()->SetTitleColor(2);

  //Second plot
  fig1->cd();
  pad2->Draw(); pad2->cd();
  T->SetMarkerColor(4);
  T->Draw("dist:y:x");
  //Get the TH3 to change Z axis color
  htemp = (TH3F*)gPad->GetPrimitive("htemp");
  htemp->SetTitle("");
  htemp->GetZaxis()->SetLabelColor(4); htemp->GetZaxis()->SetAxisColor(4); htemp->GetZaxis()->SetTitleColor(4);
    
}