Plotted entries from OPSLOG files in CRIRES report STD, plot 4 (data set plt_par4):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       MJD-OBS      values
====================================================
2010-03-09 55265.284956 3.397803192
2010-03-09 55265.404825 3.620398378