Plotted entries from OPSLOG files in XSHOOTER report ARC_SLIT_VIS, plot 2 (data set rpes):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-05-17	56065.457506 0.4 18300.7493862344
2012-05-17	56065.459706 0.9 7446.99601861193
2012-05-17	56065.704937 0.4 18191.6988967411
2012-05-18	56066.711492 0.9 7441.79141530242
2012-05-19	56067.714153 0.9 7424.32008916556
2012-05-20	56068.635822 1.5 3171.35312934021
2012-05-21	56069.685948 0.7 10674.2913407331
2012-05-22	56070.711275 0.9 7449.73421366783
2012-05-22	56070.714169 0.7 10669.3970824881
2012-05-23	56071.617840 0.9 7445.21203337583