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Why does det.raw.image not work when we enable fex?  Need to set fex→prescale = 1 to get image on every shot, 0 to disable images.  det.raw.image() should still work, but doesn't.  Need to debug.  det.ttfex.image() might be an ROI for the background events (no beam).  det.ttfex.proj_ref() is a projection of that ROI.  det.ttfex.proj_sig() for every event beam. Not sure what det.ttfex.raw() is.

BatchingEventBuilder subframes.  Not all of these are present, index into subframe array is defined by the "tdest" (like a lane number) defined in the subframe tail (AxiStream Batcher Protocol Version 1):

• 0: 32-byte timing header (after the eventbatcher "superframe" header)
• 1: (not present in the data I looked at)
• 2: Camera image
• 3: EventInfo (containing event codes)

ATM-FEX BatcherIterator Errors

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