Plotted entries from OPSLOG files in CRIRES report WAVEXCORR, plot 6 (data set plt_par_ch6):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-05	55963.450094	0.924233805562831
2012-02-06	55964.367331	0.923100902798264
2012-02-07	55965.379556	0.922901475398523
2012-02-08	55966.378292	0.924209142280053
2012-02-09	55967.866461	0.924026469191195