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Hubble Space Telescope
Particulate Contaminate Mask

NICMOS GROT MASKS

Mask file			Camera	Use After Date
NIC1 Grot Mask (8/97 - 11/97)	1	Use for data taken from 8/97 to 11/97
NIC1 Grot Mask (12/97 - 1/99)	1	Use for data taken from 12/97 to 1/99
NIC2 Grot Mask			2	Use for all NIC2 data
NIC3 Grot Mask			3	Use for all NIC3 data