{
   c1 = new TCanvas("c1","Title",200,10,700,500);
   c1->GetFrame()->SetBorderSize(12);
   TF1 * f0 = new TF1("f0","pol1", 1200, 1340);

   
   Int_t n = 8;
   Double_t x[n]  = {1200, 1220, 1240, 1260, 1280, 1300, 1320, 1340};
   Double_t y[n]  = {102.33, 114.26, 128.76, 144.56, 164.64, 188.05, 209.57, 229.65};
   Double_t ex[n] = {1,1,1,1,1,1,1,1};
   Double_t ey[n] = {0.5, 0.5, 0.75, 0.61, 0.73, 0.71, 0.42, 0.55};
   
   //return c1;


   gr0 = new TGraphErrors(n); 

   for (int i = 0; i < n; ++i) { 
      double lx = log10(x[i]); 
      double ly = log10(y[i] );
      double lex = log10(ex[i]); 
      double ley = log10(ey[i]); 
      gr0->SetPoint(i,lx,ly); 
      gr0->SetPointError(i,lex,ley); 
   }
   gr0->SetMarkerStyle(8);

   gr0->Fit("f0");
   gStyle->SetOptFit(1111);
   gr0->Draw("AP");


   // now fit the non tranformed data

   c2 = new TCanvas("c2","Title",200,10,700,500);
   c2->GetFrame()->SetBorderSize(12);
   TF1 * f1 = new TF1("f1","[0]*x^[1]", 1200, 1340);
   f1->SetParameter(0, TMath::Power(10, f0->GetParameter(0)));
   f1->SetParameter(1, f0->GetParameter(1));   

   gr = new TGraphErrors(n,x,y,ex,ey);
   gr->SetTitle("Title");
   gr->SetMarkerColor(4);
   gr->SetMarkerStyle(1);
   gr->Draw("AP");

   gr->Fit("f1");
   f1->Draw("SAME");
   gStyle->SetOptFit(1111);
   
   return c1;
}