How to extract the values of a variable in ntuple ?

From: Jayoung Wu (jayoung@glue.umd.edu)
Date: Fri Feb 11 2000 - 20:55:52 MET 

Hi,

In file1, I created a ntuple "si_en":
   TFile *ntfile = new TFile("Science.root","RECREATE","ATIC SCIENCE NTUPLE",2);
   TNtuple *si_en = new TNtuple("si_en","SI ENERGY","inx:iny:ed");

In file 2, I want to extract the values of ed in si_en one by one:
  char s1[80],s2[80];
  Int_t i,j;
  TCanvas *can;
  TFile *ntfile = new TFile("Science.root");
  gStyle->SetOptStat(1);
  TNtuple *nt;

  nt = (TNtuple*)ntfile->Get("si_en");

  for( i=0 ; i<12 ; i++ ){  
     for( j=8 ; j<48 ; j++ ){
  ???

       How can I extract the values of inx, iny, and ed of ntuple, si_en
       one by one?
---
Thanks,
Jayoung

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