The filter wheel for OC61 was stuck on several recent nights, namely 20250716 through 20250719UT. The wheel was repaired on 20250720, so about half of 20250720, and all nights 20250721 forward are ok.
That said, the 20250720 and 20250721 images that were distributed used in part earlier flats. Cliff is going to reprocess 20250720-21 today, so you will get an additional “you have data” email for any images from 20250720-21. Please use this new processing and not the earlier processing, and delete any 20250721 submissions and check 20250720 carefully, deleting any measures that look discrepant. Our apologies for this problem.
Arne