Study 000640: Updated from regcal071 (study 000027) M.Whillock, MSSL 20220915 1) Acronym: regcal081 2) Repeats: 1 3) 2 dark exposures (150 sec exps), full ccd, bottom 512 rows of CCDs 4) Time required: 6m 5) Target: None (shutter closed) WARNING: DO NOT run within SAA High DR