Opening a specific version of a ntuple in a root file

I have a ROOT files containing different version of the same ntuple as follows. How to open a specific version of the ntuple, e.g. “nt;1”. Any hints are appreciated.

root [3] TFile f1("o0.root")
(TFile &) Name: o0.root Title: 
root [4] .ls
TFile**		o0.root	
 TFile*		o0.root	
  KEY: TNtuple	nt;10	
  KEY: TNtuple	nt;9	
  KEY: TNtuple	nt;8	
  KEY: TNtuple	nt;7	
  KEY: TNtuple	nt;6	
  KEY: TNtuple	nt;5	
  KEY: TNtuple	nt;4	
  KEY: TNtuple	nt;3	
  KEY: TNtuple	nt;2	
  KEY: TNtuple	nt;1

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