Plotted entries from OPSLOG files in VIRCAM report TWILRAWAVG_K_AVG, plot 3 (data set det_rms):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS		det_ID     	values
====================================================
2012-05-06	56053.939679	RMS				1569.53
2012-05-12	56059.934571	RMS				528.095
2012-05-16	56063.933592	RMS				545.696
2012-05-20	56067.931777	RMS				607.552