{
 
  ifstream in;
  in.open("textfile.txt");

  int n=100;
  double x1,x2,y;
   
  TH1D *h1=new TH1D("",100,0,1);
  
  for (int i = 0; i <n ; i++) {
     
    in>>x1>>x2>>y;
     
    h1->Fill(x,y);
    
  }
   
  //now how can I create an axis where I have x2 values on the x axis of histogram h1?
  //There's no specific law for the distribution of x2 values, sicne they are measured values.


  
}