SEGUE1_TARGET2: SEGUE-1 secondary target bits

Bit name	Binary digit	Description
SCIENCE	1	Science Target
SEGUE1_REDDENING	2	Reddening standard
SEGUE1_QA*	3	QA Duplicate Observations
SKY	4	Empty area for sky subtraction
SEGUE1_SPECPHOTO	5	Spectrophotometric standard star

*QA duplicate observations are not currently marked in segue1_target2 bitmasks. These are only marked in sourcetype in SpecObjAll.