Plotted entries from OPSLOG files in UVES report BIAS_BLUE_2x2_50kHz, plot 2 (data set RON_raw_P):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2011-11-17	55883.381826	4.1332
2011-11-18	55884.368801	4.1305
2011-11-19	55885.394262	4.1188
2011-11-20	55886.382906	4.1243
2011-11-21	55887.387797	4.1355
2011-11-22	55888.410527	4.1182
2011-11-23	55889.304613	4.1195
2011-11-24	55890.304561	4.1212
2011-11-25	55891.381511	4.1283
2011-11-26	55892.384070	4.1686
2011-11-27	55893.407019	4.1455
2011-11-28	55894.388346	4.1201
2011-11-29	55895.302919	4.1264