Plotted entries from OPSLOG files in UVES report ECH_RESOLUTION_DHC, plot 3 (data set psR580U_P):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-01-30	55957.343070	107773.8429
2012-01-31	55958.267824	107298.2115
2012-02-01	55959.422019	107916.5096
2012-02-02	55960.444465	107750.523
2012-02-03	55961.442008	108298.2027
2012-02-04	55962.433819	107942.0658
2012-02-05	55963.461793	108345.4992
2012-02-06	55964.382030	106600.1498
2012-02-07	55965.382185	108132.5665
2012-02-08	55966.377440	108080.0359
2012-02-09	55967.386382	107641.9836