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

DATE       MJD-OBS      parameter values
==========================================================================
2008-08-31 54709.426459 196.	parQ1lo
2008-09-01 54710.523207 196.	parQ1lo
2008-09-02 54711.416388 196.	parQ1lo
2008-09-03 54712.422313 196.	parQ1lo
2008-09-04 54713.417110 196.	parQ1lo