Produced by psana/src/dgram.cc.
Accessed from psana event with a pattern like:
evt._dgrams[nDgram].detname[nSegment].drpClassName.attr1.attr2...
- detname is defined by the hutch. For example: "xppcspad" or "xpphsd"
- nSegment is an integer, denoting which portion of a larger detector this is (e.g. cspad panel number)
- drpClassName is defined by the DRP segment-level software via the "Alg" parameter to xtcdata/xtcdata/xtc/ShapesData.hh:Names class. For example: "raw", "fex", "roi1", "roi2"
A complication: the different detector segments can be split over several datagrams (offline event-build) or be all in one datagram (online event-build)
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