Plotted entries from OPSLOG files in NACO report DAILY_DARKRON, plot 1 (data set ronDCR_HC):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2013-05-14	56427.482311320000000	6.08048475506672
2013-05-15	56428.469362980000000	5.768373785994
2013-05-16	56429.359979030000000	4.12340587121919
2013-05-17	56430.362984550000000	5.81900869395441