Study 000656: Updated from regcal071 (study 000027) M. Whillock, MSSL 20220915 Updated from regcal081 (study 000640) M. Whillock, MSSL 20250414 1) Acronym: regcal091 2) Repeats: 1 3) 2 dark exposures (300 sec exps), full ccd, bottom 512 rows of CCDs 4) Time required: 10m 20s 5) Target: None (shutter closed) WARNING: DO NOT run within SAA High DR