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This is a candidate for L1Proc. The differences in the comparison with the preceding L1 Proc version, GR v15r33, are mostly from GR v15r35, some of these were due to ACD geometry updates (trapezoidal tiles) and do not apply to this comparison since that version of the geometry is not included in this release.
(See GR v15r37 for some discussion of the ACD geometry and effects.)
The system test changes between r39 and r33 are minor and likely due to variations in the simulated event sample that happen when something is changed in the simulated events, i.e. changes to Gleam, G4Propagator.
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