Exposure numbers	uses
1 – 999	Science and science calibration data
1000 – 5999	unused
6000 – 6999	Test exposures by the night staff
7000 – 7099	VIRUS Defocused (Spectral) Flat data (VDF/DSF)
7100 – 7199	VIRUS Alignment Characterization data (VAC)
7200 – 7299	Virus bias date test
7300 – 7999	Unused
8000 – 8099	PJM test data
8100 – 8199	JF day use
8200 – 8299	RB day use
8300 – 9899	unused
9900 – 9999	Afternoon RA OPS work
10,000+	unused

(last updated 23 May 2019)