Plotted entries from OPSLOG files in UVES report BIAS_BLUE_2x2_50kHz, plot 6 (data set duty_cycle_P):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2011-11-17	55883.381826	0.000560342
2011-11-18	55884.368801	0.000560285
2011-11-19	55885.394262	0.000560255
2011-11-20	55886.382906	0.000560255
2011-11-21	55887.387797	0.000560227
2011-11-22	55888.410527	0.000560344
2011-11-23	55889.304613	0.000560343
2011-11-24	55890.304561	0.000560343
2011-11-25	55891.381511	0.000560257
2011-11-26	55892.384070	0.000560228
2011-11-27	55893.407019	0.000560257
2011-11-28	55894.388346	0.000560286
2011-11-29	55895.302919	0.000560343