Plotted entries from OPSLOG files in MIDI report DSPTRN_2.0, plot 4 (data set TRANS_GRISM_ARIII_ops):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-07	55965.390324	0.517218
2012-02-08	55966.382431	0.517985
2012-02-09	55967.392928	0.516682