The OTA CCDs have known artifacts and anomalies. A lot of work has gone into characterizing these artifacts, and removing them if possible. Pixels affected by these artifacts or anomalies are kept tracked of in the mask images with pixel flags.
Use Heading 1 for main sections, 2 for the next level down, etc.
Row-by-row bias correction
Background oversubtraction
Burntool artifacts
Astrometry failures
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