Hey Joe (...), I have not the complete list in mind but if you want to know it, the best way is to open your root file with the TBrowser command. Open your root file with the command: root -l your_root_file.root And then type the command: TBrowser r A window will open where you can navigate through the root trees and see in each what are the variables. Hope it helps, Simon <div class="gmail_quote">On Fri, May 22, 2009 at 4:42 PM, Joseph Stevick <<a href="mailto:jws37@cam.ac.uk">jws37@cam.ac.uk</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">Hi there, Does anyone have a complete list of the ROOT output variables and their descriptions? Sincerely, Joe Stevick _______________ Joseph Stevick <a href="mailto:jws37@cam.ac.uk" target="_blank">jws37@cam.ac.uk</a> _______________________________________________ Gate-users mailing list <a href="mailto:Gate-users@lists.healthgrid.org" target="_blank">Gate-users@lists.healthgrid.org</a> <a href="http://lists.healthgrid.org/mailman/listinfo/gate-users" target="_blank">http://lists.healthgrid.org/mailman/listinfo/gate-users</a> </blockquote></div>