Plotted entries from OPSLOG files in UVES report BIAS_BLUE_2x2_50kHz, plot 3 (data set RON_m_P):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2011-11-17	55883.381826	2.2362
2011-11-18	55884.368801	2.2381
2011-11-19	55885.394262	2.2287
2011-11-20	55886.382906	2.2308
2011-11-21	55887.387797	2.2289
2011-11-22	55888.410527	2.2295
2011-11-23	55889.304613	2.2245
2011-11-24	55890.304561	2.2285
2011-11-25	55891.381511	2.2301
2011-11-26	55892.384070	2.2471
2011-11-27	55893.407019	2.2399
2011-11-28	55894.388346	2.2286
2011-11-29	55895.302919	2.232