Plotted entries from OPSLOG files in VIRCAM report IQ_Z_AVG, plot 1 (data set det_avg):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS		det_ID     	values
====================================================
2014-12-23	57015.011481	AVG				1.35993