Plotted entries from OPSLOG files in VISIR report RON, plot 2 (data set ron_specP):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS      	values
====================================================
2012-05-04	56052.567561	24.2932385018555
2012-05-04	56052.569014	15.7945562972495
2012-05-04	56052.572565	11.5742551853813
2012-05-04	56052.575217	10.6378363788463
2012-05-04	56052.576870	12.3330589948998
2012-05-04	56052.583050	11.4943314217881
2012-05-04	56052.590992	10.9573018393482
2012-05-04	56052.592561	13.8362374968508
2012-05-04	56052.594370	13.6515197648365
2012-05-07	56055.710978	30.8663650755124
2012-05-07	56055.712458	14.5430332335589
2012-05-08	56056.493487	27.470085562421
2012-05-08	56056.494989	15.6645671745714