Hi Matt, and others responsible for generated/simulated data, I have a question: I took your data from: /mss/hallb/hps/production/readout/tritrig-beam-tri/2pt2/ tritrigv1-egsv3-triv2-g4v1_s2d6-readout20140522_[1-10000].slcio and from description I thought this was a right mix of trident data and beam background. However, I found some difficulty interpreting these files: 1. there is no distinction between "signal" (trident) and background, if you select events produced at t=0 and having no parents they are still not distinguishable completely (usually >3 particles/event); 2. even if you find a combination of 3 particles with close missing mass it is >10^-2 GeV (varying), while I expected <10^-4 GeV^2 (fixed). Any suggestion? Best Regards, Mikhail. ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the HPS-SOFTWARE list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=HPS-SOFTWARE&A=1