Plotted entries from OPSLOG files in VIRCAM report ZP_Z_AVG, plot 2 (data set det_all):
(DATE changes at 21:00 UT or MJD-OBS = xxx.875)
DATE       	MJD-OBS		det_ID     	values
====================================================
2014-12-23	57015.011483	DET1.CHIP1	23.79249954
2014-12-23	57015.011484	DET1.CHIP2	23.49294472
2014-12-23	57015.011485	DET1.CHIP3	23.53053284
2014-12-23	57015.011486	DET1.CHIP4	23.68194199
2014-12-23	57015.011487	DET1.CHIP5	23.69094086
2014-12-23	57015.011488	DET1.CHIP6	23.77210808
2014-12-23	57015.011489	DET1.CHIP7	23.65752792
2014-12-23	57015.011490	DET1.CHIP8	23.58566475
2014-12-23	57015.011491	DET1.CHIP9	23.71077538
2014-12-23	57015.011492	DET1.CHIP10	23.69067192
2014-12-23	57015.011493	DET1.CHIP11	23.64028549
2014-12-23	57015.011494	DET1.CHIP12	23.74319839
2014-12-23	57015.011495	DET1.CHIP13	23.53144836
2014-12-23	57015.011496	DET1.CHIP14	23.65308189
2014-12-23	57015.011497	DET1.CHIP15	23.71193123
2014-12-23	57015.011498	DET1.CHIP16	23.46014595