title: CERN ROOT Extract Data from TNtuple
body: <p>I am using CERN's ROOT framework (required), and I want to take data from a TNtuple and graph it.  I can either graph the data when I create the TNtuple, or after I write it to a .root file.  Some of the support documentation suggested that I create a TTree, but that seemed like it might be overkill/roundabout since I wouldn't be using it for anything else (and the TNtuple fulfills all of my other requirements).   Does anyone have a better suggestion for how to extract data from the TNtuple and graph it?</p>