Plotted entries from OPSLOG files in VIMOS report ZEROPOINTS_U, plot 3, data set parQ3:

DATE       MJD-OBS      parameter values
==========================================================================
2008-11-21 54791.004242 26.6853450388427	parQ3
2008-11-21 54791.347271 26.4705737680908	parQ3
2008-11-22 54792.000861 26.6639712900634	parQ3