Plotted entries from OPSLOG files in VIRCAM report TWILRAWRANGE_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				168.892
2012-05-12	56059.934571	RMS				634.548
2012-05-16	56063.933592	RMS				637.323
2012-05-20	56067.931777	RMS				947.602
2012-05-23	56070.931346	RMS				836.544