Plotted entries from OPSLOG files in VIRCAM report TWILRAWRANGE_Z_AVG, plot 3 (data set det_rms):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS		det_ID     	values
====================================================
2014-12-23	57015.000175	RMS				905.92