Plotted entries from OPSLOG files in CRIRES report WAVEXCORR, plot 5 (data set plt_par_ch5):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-05	55963.450094	0.867908217550303
2012-02-06	55964.367331	0.86765557076215
2012-02-07	55965.379556	0.867422933935936
2012-02-08	55966.378292	0.868012585979324
2012-02-09	55967.866461	0.86917169963136