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Tracy took a look at the discrepancy and found that this is a problem in the MC simulations exposed by the new and early processed "non-physics" filter bit in GammaFilterV3. This is not a problem for data and did not appear in the test bed studies. The new filter version makes a cut on GEM bits, and these are not being set properly in the simulation. This will clearly need to be fixed in the simulations, but Tracy concludes it will not impact data processing.
I'm also attaching the plots remade from the system test merit files with the trigger and filter conditions applied:
GltGemSummary>0 && ObfGamStatus>0
The post cuts filter energy distribution for the AllGamma test is close to identical. Note that the background test has events. Looking into why the above plot for the backgnd test disagrees.
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