from psana import *
ds = DataSource('exp=xpptut15:run=54:smd')
for nevent,evt in enumerate(ds.events()):
evr = evt.get(EvrData.DataV4, Source('DetInfo(NoDetector.0:Evr.0)'))
if evr is None: continue
for fifoEvent in evr.fifoEvents():
print fifoEvent.eventCode(),
print
if nevent==3: break
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