Plotted entries from OPSLOG files in CRIRES report FLAT_IRHa, plot 8 (data set plt_par8):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-05-17	56065.470963	144.933325195313
2012-05-18	56066.483650	148.877770996094
2012-05-19	56067.464773	127.4
2012-05-20	56068.603677	139.155554199219
2012-05-21	56069.470060	141.066662597656
2012-05-22	56070.467534	134.916662597656