Plotted entries from OPSLOG files in UVES report ECH_RESOLUTION_DHC, plot 2 (data set psR580L_P):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-01-30	55957.343070	115502.4222
2012-01-31	55958.267824	114995.1435
2012-02-01	55959.422019	113956.6707
2012-02-02	55960.444465	113775.2029
2012-02-03	55961.442008	113515.9657
2012-02-04	55962.433819	113409.1771
2012-02-05	55963.461793	113177.3855
2012-02-06	55964.382030	113408.0531
2012-02-07	55965.382185	113265.3538
2012-02-08	55966.377440	113816.9868
2012-02-09	55967.386382	113533.3614