Plotted entries from OPSLOG files in NACO report RON, plot 2 (data set ronUCR_HC):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-01-12	55939.385835	4.67525758416154
2012-01-12	55939.391720	5.21292647645641
2012-01-12	55939.397781	4.52179905199984
2012-01-12	55939.398354	4.5392730695564