Plotted entries from OPSLOG files in VIMOS report BIASRMS, plot 6:

DATE       MJD-OBS      parameter values
==========================================================================
2009-01-04 54835.370784 1.22359324346819	parQ4lo
2009-01-05 54836.392264 1.22245501810735	parQ4lo
2009-01-07 54838.525175 1.22246161176738	parQ4lo
2009-01-08 54839.486003 1.22197237818846	parQ4lo
2009-01-09 54840.509749 1.212536355277	parQ4lo