Plotted entries from OPSLOG files in UVES report BIAS_rron_DHC, plot 6 (data set psREDU_2x2_50_P):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-05-13	56061.401239	5.0058
2012-05-14	56062.399241	4.9239
2012-05-15	56063.456329	4.9244
2012-05-16	56064.632984	4.98
2012-05-17	56065.462553	4.9857
2012-05-18	56066.622087	5.0128
2012-05-19	56067.469902	5.0078
2012-05-20	56068.482271	4.9985
2012-05-21	56069.463481	5.044
2012-05-22	56070.466142	5.0384
2012-05-23	56071.410990	4.9902