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# The SKYWCS library structure.
define LEN_SKYCOOSTRUCT (30 + SZ_FNAME + 1)
define SKY_VXOFF Memd[P2D($1)] # logical ra/longitude offset
define SKY_VYOFF Memd[P2D($1+2)] # logical dec/tatitude offset
define SKY_VXSTEP Memd[P2D($1+4)] # logical ra/longitude stepsize
define SKY_VYSTEP Memd[P2D($1+6)] # logical dec/latitude stepsize
define SKY_EQUINOX Memd[P2D($1+8)] # equinox of ra/dec system (B or J)
define SKY_EPOCH Memd[P2D($1+10)] # epoch of observation (MJD)
define SKY_CTYPE Memi[$1+12] # celestial coordinate system code
define SKY_RADECSYS Memi[$1+13] # ra/dec system code
define SKY_WTYPE Memi[$1+14] # sky projection function code
define SKY_PLNGAX Memi[$1+15] # physical ra/longitude axis
define SKY_PLATAX Memi[$1+16] # physical dec/latitude axis
define SKY_XLAX Memi[$1+17] # logical ra/longitude axis
define SKY_YLAX Memi[$1+18] # logical dec/latitude axis
define SKY_PIXTYPE Memi[$1+19] # iraf wcs system code
define SKY_NLNGAX Memi[$1+20] # length of ra/longitude axis
define SKY_NLATAX Memi[$1+21] # length of dec/latitude axis
define SKY_NLNGUNITS Memi[$1+22] # the native ra/longitude units
define SKY_NLATUNITS Memi[$1+23] # the native dec/latitude units
define SKY_STATUS Memi[$1+24] # the status (OK or ERR)
define SKY_COOSYSTEM Memc[P2C($1+25)] # the coordinate system name
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