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
====================================================
2010-03-14 55270.441546 0.9059867299
2010-03-15 55271.445417 0.9041117463
2010-03-16 55272.449772 0.9067948915
2010-03-17 55273.443656 0.9056693598
2010-03-18 55274.449477 0.9065968159
2010-03-19 55275.449061 0.9061045435