Plotted entries from OPSLOG files in VIMOS report BIASRMS, plot 4, data set parQ1hi:

DATE       MJD-OBS      parameter values
==========================================================================
2008-11-19 54789.593795 4.66107087284789	parQ1hi
2008-11-20 54790.551116 4.6930621768248	parQ1hi
2008-11-21 54791.518803 4.7130814200341	parQ1hi