Plotted entries from OPSLOG files in CRIRES report FLATSTAB, plot 1 (data set plt_par1):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-05	55963.451591	487.389990234375
2012-02-06	55964.368835	484.28251953125
2012-02-07	55965.381033	459.771923828125
2012-02-08	55966.379796	465.489990234375
2012-02-09	55967.867948	465.372509765625
2012-02-10	55968.455211	480.88916015625