WHAM -- Wisconsin H-Alpha Mapper
VTSS -- Virginia Tech Spectral-Line Survey
SHASSA -- Southern H-Alpha Sky Survey Atlas
Composite -- Finkbeiner (2003)
Bit Mask
Bit Name Comments --- --------- ------------------------------------------------------- 0 'WHAM' WHAM data used (Wisconsin) 1 'VTSS' Virginia Tech Spectral line Survey 2 'SHASSA' Southern Halpha Sky Survey Atlas 3 'STAR' Star removed 4 'SATUR' Saturated pixel nearby in continuum exposure 5 'BRT_OBJ' Bright star/galaxy - measurements unreliable 6 'BIG_OBJ' Position near LMC, SMC, or M31; no sources removed 7 'HI_VEL' High Velocity in WHAM data