Plotted entries from OPSLOG files in CRIRES report WAVEXCORR, plot 7 (data set plt_par_ch7):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-05	55963.450094	0.739068791265025
2012-02-06	55964.367331	0.731769319225095
2012-02-07	55965.379556	0.722643359670454
2012-02-08	55966.378292	0.733850416883361
2012-02-09	55967.866461	0.733121175937636