Plotted entries from OPSLOG files in ISAAC report DARK_SW_DC, plot 4 (data set p_RMS):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2013-06-15	56459.449778990000000	0.264573977671379
2013-06-15	56459.530915320000000	0.305493725266255
2013-06-15	56459.558504420000000	0.608278259860294