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Mona writes about psana2: eventbuilder requires that all non-L1 have to be complete (i.e. all streams need to see SlowUpdate).  This suggests to cpo that we need to eliminate the 0x80 bit and set xpm-pause_threshold low enough that we always guarantee at least one SlowUpdate can be received by all detectors.

Brainstorming

Issue: SlowUpdate currently preempts L1Accept, so integrating detectors miss their normalization data

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