#include <TH2D.h>
#include <TColor.h>
#include <TStyle.h>
#include <TCanvas.h>
using namespace std;

void paleta() {
  //palette settings - completely independent
  const Int_t NRGBs = 6;
  const Int_t NCont = 999;

  Double_t stops[NRGBs] = { 0.00, 0.1, 0.34, 0.61, 0.84, 1.00 };
  Double_t red[NRGBs]   = { 0.99, 0.0, 0.00, 0.87, 1.00, 0.51 };
  Double_t green[NRGBs] = { 0.00, 0.0, 0.81, 1.00, 0.20, 0.00 };
  Double_t blue[NRGBs]  = { 0.99, 0.0, 1.00, 0.12, 0.00, 0.00 };


  TColor::CreateGradientColorTable(NRGBs, stops, red, green, blue, NCont);
  gStyle->SetNumberContours(NCont);

  gStyle->SetOptStat(0);
  
  //here the actually interesting code starts
  const Double_t min = 0.9;
  const Double_t max = 1.1;
  
  const Int_t nLevels = 999;
  Double_t levels[nLevels];

  
  for(int i = 1; i < nLevels; i++) {
    levels[i] = min + (max - min) / (nLevels - 1) * (i);
  }
  levels[0] = 0.01;
  //  levels[0] = -1; //Interesting, but this also works as I want!
  
  TCanvas * c = new TCanvas();
  TH2D *h  = new TH2D("h", "", 10, 0, 10, 10, 0, 10);
  h->SetContour((sizeof(levels)/sizeof(Double_t)), levels);
 
  h->SetBinContent(5, 7, 1.20);
  h->SetBinContent(5, 6, 1.05);
  h->SetBinContent(5, 5, 1.00);
  h->SetBinContent(5, 4, 0.95);
  h->SetBinContent(5, 3, 0.80);
 
  h->DrawClone("col text");// draw "axes", "contents", "statistics box"
 
  h->GetZaxis()->SetRangeUser(min, max); // ... set the range ...
 
  h->Draw("z same"); // draw the "color palette"
  c->SaveAs("c.png");
}