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This script lives in /reg/g/psdmsdf/group/lcls/ds/ana/tutorials/examplePython3psana1_examples/evr.py.  EVR data is often used to determine what happened on an event by looking at "event codes".  Experiments often use these event codes to indicate whether a pump laser was on/off for a particular shot, or whether beam was present on that shot ("dropped shots").  Experiments sometimes set up complex "event sequences" to create different behavior on different shots (via different event-codes generated by the LCLS timing system).

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