In questionable circumstances, it is also good to check the actual dark images, comparing them with previous and subsequent nights for consistency. These should be noted whenever seen during the QA evaluation. Otherwise identify the RA, Dec of the star and record it for later reference. This is summarized on the night page. One should look both at whether the summary indicates minimum photometricity requirements have been met as well as the links to figures.
Red symbols indicate failure for that calibrator scan.
The sigma vs. time shows how the night progresses. Here one should explain any overrides to the calmon namelist and justify why the quality was or was not degraded by this. A useful check of photometric stability is to see how close in magnitude stars appear in overlapping scan regions. If the overlaps look good, one is encouraged to try to fix the cal photometricity by altering defaults. Photometric quality factor is affected by repeatability in overlaps.