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from psana import *
ds = DataSource('exp=xppdaq12:run=54:smd')
det = Detector('cspad',ds.env())
for nevent,evt in enumerate(ds.events()):
    # includes pedestal subtraction, common-mode correction
    # bad-pixel suppresionsuppression, and geometry
    img = det.image(evt)
    break
import matplotlib.pyplot as plt
plt.imshow(img,vmin=-2,vmax=2)
plt.show()