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Trigger mask is FD8. Go to GEM manual page 98, section 2.9.1` Tower enable registers 0xFD8 = 111111011000 , tower 0 no triggers, tower 1 only CAL, Towers 2 and 3 CAL and TKR enabled.
CU_BT_GSI_122_seds4.xml that was used for GSI was used for the test. So need to look for the correct schema file