Plotted entries from OPSLOG files in CRIRES report WAVEXCORR, plot 3 (data set plt_par_ch3):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-05	55963.448435	0.920911831420624
2012-02-06	55964.365666	0.914948708895751
2012-02-07	55965.377889	0.920967910426391
2012-02-08	55966.376633	0.920614459159043
2012-02-09	55967.864803	0.922868881743214