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I basically confirm Philippe's comments :
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for the PT evts that are clearly bound to kill an overlaid gamma:
- many have lots of activity in the CAL, in some cases with very large clusters extending to several modules
- several have ACD tiles corresponding to tracks
- a good number have only TKR activity, unrelated to CAL activity
But I also noticed quite some evts which apparently have no visible signal at all in the ED, and the only non-zero quantity in the merit is from some ACD tile; it is hard to believe that these will kill a good gamma event. This is a non negligible fraction of the evts, but I cannot make a more quantitative statement right now.
Carmelo warned me that in some cases FRED looses sync between digis and merit when moving back and fwd between evts, so I should recheck this