Plotted entries from OPSLOG files in VISIR report BACKGD, plot 1, data set bgd_sP:

DATE       MJD-OBS      parameter values
==========================================================================
2008-09-15 54724.018788 -2453.299479	bgd_sP
2008-09-15 54724.999205 -2572.136458	bgd_sP
2008-09-16 54725.298325 -2405.477604	bgd_sP
2008-09-16 54725.975410 -1377.101758	bgd_sP