Plotted entries from OPSLOG files in VIMOS report BIASRMS, plot 3, data set parQ2hi:

DATE       MJD-OBS      parameter values
==========================================================================
2008-11-19 54789.593795 3.32421791989333	parQ2hi
2008-11-20 54790.551115 3.33026397669081	parQ2hi
2008-11-21 54791.518803 3.28319985496095	parQ2hi