Plotted entries from OPSLOG files in VIMOS report BIASRMS, plot 2, data set parQ1lo:

DATE       MJD-OBS      parameter values
==========================================================================
2008-11-19 54789.591453 1.32215524648257	parQ1lo
2008-11-20 54790.548764 1.31906035821305	parQ1lo
2008-11-21 54791.516456 1.31995979494706	parQ1lo