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from psana import *
ds = DataSource('exp=xpptut15:run=200:smd')
cd = Detector('ControlData')
for run in ds.runs():
    for nstep,step in enumerate(dsrun.steps()):
        pvList = cd().pvControls()
        for pv in pvList:
            print 'Step',nstep,'name/value:',pv.name(),pv.value()
        for evt in step.events():
            pass
        if nstep>=2:
            import sys
            sys.exit()