Plotted entries from OPSLOG files in FORS1 report BIAS_fp_raw, plot 4:

DATE       MJD-OBS      parameter values
==========================================================================
2009-03-31 54921.432980 0.0831471068278854	parC2lm
2009-04-01 54922.434290 0.121642758589838	parC2lm