Plotted entries from OPSLOG files in VIMOS report BIASRMS, plot 7, data set parQ3hi:

DATE       MJD-OBS      parameter values
==========================================================================
2008-11-19 54789.593795 21.0450295883327	parQ3hi
2008-11-20 54790.551115 21.3101110746339	parQ3hi
2008-11-21 54791.518803 20.1191743837086	parQ3hi