lower nEvents for SC CEP yy

Jan Kretzschmarrequested to merge
jkretz-master-patch-73896 into master

Description of bug

ATLHI-510 EVGEN jobs had very incoherent run time from 4h - >24h, leading to 20% evgen job failures

Changes introduced

lower nEvents from 500 -> 200 previous productions were obsoleted

Tests

none

Issues resolved

Closes #

Edited by Jan Kretzschmar

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