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# Define the sky subtraction structure
define LEN_RSKYSUB 20 + 5 * SZ_FNAME
define RS_LOWER Memr[P2R($1)] # lower good data limit
define RS_UPPER Memr[P2R($1+1)] # upper good data limit
define RS_LNSIGREJ Memr[P2R($1+2)] # low side clipping factor
define RS_UNSIGREJ Memr[P2R($1+3)] # high side clipping factor
define RS_BINWIDTH Memr[P2R($1+4)] # histogram binwidth
define RS_BLANK Memr[P2R($1+5)] # undefined pixel value
define RS_RESCALE Memi[$1+6] # recompute scaling factor ?
define RS_RESUBTRACT Memi[$1+7] # compute the subtracted image
define RS_NCOMBINE Memi[$1+8] # number of images to combine
define RS_NMIN Memi[$1+9] # min images to combine
define RS_MAXITER Memi[$1+11] # maximum number of iterations
define RS_COMBINE Memi[$1+12] # combining method
define RS_NLOREJ Memi[$1+13] # low side pixels to reject
define RS_NHIREJ Memi[$1+14] # high side pixels to reject
define RS_KYFSCALE Memc[P2C($1+15)] # scaling factor keyword
define RS_ISCALES Memc[P2C($1+15+SZ_FNAME)] # scaling method
define RS_STATSEC Memc[P2C($1+15+2*SZ_FNAME)] # statistics section
define RS_KYSKYSUB Memc[P2C($1+15+3*SZ_FNAME)] # sky subtraction keyword
define RS_KYHMASK Memc[P2C($1+15+4*SZ_FNAME)] # holes mask keyword
# Define the sky combining options
define RS_COMBINESTR "|average|median|"
define RS_MEAN 1
define RS_MEDIAN 2
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