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Beam Line Data is smaller data that can be delivered to all hutches (i.e. not associated with the DAQ system in one hutch).  This script lives in in /reg/g/psdm/tutorials/examplePythonexamplePython3/bld.py.

Code Block
from psana import *
ds = DataSource('exp=xpptut15:run=59:smd')
ebeamDet = Detector('EBeam')
for nevent,evt in enumerate(ds.events()):
    ebeam = ebeamDet.get(evt)
    if ebeam is None: continue
    print (ebeam.ebeamPhotonEnergy())
    break