Here are some links to pages with information about the cosmics data runs from ATHENA that I've been working on, including some representative histograms & macros from ROOT. Enjoy.
MacrosPage - contains some of the macros used I used on the data
HistogramsPage - actual plots, with a brief explanation of what you're looking at
CurrentProgress - what I'm working on at the moment
TalksArchive - a storage place for presentations I've made
NotePage - will contain plots etc to appear on the note