Plotted entries from OPSLOG files in VIRCAM report LINEARITY_AVG, plot 3 (data set det_rms):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS		det_ID     	values
====================================================
2012-05-12	56060.705529	RMS				2.31904
2012-05-19	56067.659288	RMS				2.2478