Here are shown plots of the median DARK1 for each available night. Differences between the odd and even medians are on the order of 1000-2000.
Abscissas are survey day number.
A PostScript version is here. All three cameras show sudden jumps, H of up to 2500 DN, with intervals of stability between, during which variation is confined within a range of 500 or less. Most of the major changes are well correlated with known survey events, but a few, notably in the H camera near days 650 and 950, are not. A PostScript version is here. Again as in the north, most changes can be identified with known survey events, especially the switch to Leach electronics at survey day 729.