Hi Peter, I got distracted when I had to do battle with the TDC400s. I didn't get the zoom version into the code until just before all of the data was corrupt. There should be plenty of good runs to look at. You can look at files runs 31659 and higher on puma (odd numbers) and runs 31666 and higher on lion (even runs). The files are at /local/2/muplus/mta/mta_#####.root -Brendan