Southern K Median Flats & deviations about the median

Display range is 0.8-1.2 for flats, 0.0-0.1 for deviations. The third image is the difference between the canonical flat and the "super duper" grand canonical flat (computed from the average of periods 04-08) displayed at a -0.03 to +0.03 stretch. Suggested breaks have been indicated between image rows.

Hardware periods that had to be subdivided

01  970000 980502
02a 980503 981030
02b 981031 990117
03  990118 990226
04  990227 990507
05  990508 990624
06a 990625 991010
06b 991010 000218
06c 000219 000417
07  000418 000908
08  000909 050000

Original periods subdivided above:

02 980503 990117
06 990625 000417