Plotted entries from OPSLOG files in MIDI report DSPTRN_2.0, plot 3 (data set TRANS_PRISM_SIV_ops):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-02-07	55965.384919	0.833306
2012-02-08	55966.377014	0.83194
2012-02-09	55967.387500	0.832033