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# Definitions for SKYBLOCK algorithm.
define SKBSKYMIN 10000 # Minimum number of sky pixels in subblock
define SKBFRAC 0.66 # Frac of sky pix in subblock for sky estimate
define SKBGROW 1.5 # Grow for rejected subblocks
define SKBSIGBIN 2.5 # Sigma width of histogram
define SKBA 0.01 # Histogram resolution
define SKBNMINPIX 50 # Minimum number of pixels/subblock/side
define SKBNMINBINS 500 # Minimum average bin population
define SKBHISTWT 2 # Default histogram weighting power
define SKBCNV "" # Convolution
define SKB_STRLEN 99 # String length in parameters
define SKB_LEN 82 # Sky block structure length
# The following apply to all images.
define SKB_BLKSTEP Memi[$1] # Step size
define SKB_BLKSIZE Memi[$1+1] # Number of pixels or blocks
define SKB_NSUBBLKS Memi[$1+2] # Number of subblocks per block
define SKB_SKYMIN Memi[$1+3] # Minimum number of sky pixels
define SKB_NMINPIX Memi[$1+4] # Min pixels/subblock/side
define SKB_SIGBIN Memr[P2R($1+5)] # Histogram sigma limit
define SKB_A Memr[P2R($1+6)] # Histogram resolution
define SKB_B Memr[P2R($1+7)] # Bin start
define SKB_NBINS Memi[$1+8] # Number of bins
define SKB_NMINBINS Memi[$1+9] # Min avg bin population
define SKB_HISTWT Memi[$1+10] # Histogram weighting power
define SKB_SIGFAC Memr[P2R($1+11)] # Sigma correction factor
define SKB_FRAC Memr[P2R($1+12)] # Frac of sky pix in subblock
define SKB_GROW Memr[P2R($1+13)] # Grow for rejected subblocks
define SKB_CNV P2C($1+14) # Pointer to convolution string (99)
# The following are set for each image.
define SKB_NCBLK Memi[$1+65] # Number of blocks across image
define SKB_NLBLK Memi[$1+66] # Number of blocks across image
define SKB_NCPIX Memi[$1+67] # Number of pixels in blocks
define SKB_NLPIX Memi[$1+68] # Number of pixels in blocks
define SKB_NCSBLK Memi[$1+69] # Number of subblocks across image
define SKB_NLSBLK Memi[$1+70] # Number of subblocks across image
define SKB_NCSPIX Memi[$1+71] # Number of pixels in subblocks
define SKB_NLSPIX Memi[$1+72] # Number of pixels in subblocks
define SKB_NSKYMIN Memi[$1+73] # Minimum pixels to evaluate histogram
define SKB_BINS Memi[$1+74] # Pointer to bins
define SKB_NAV Memi[$1+75] # Number of bins to average for weights
define SKB_NSKY Memi[$1+76] # Pointer to num sky pix
define SKB_EXP Memi[$1+77] # Pointer to exposure values
define SKB_SKYS Memi[$1+78] # Pointer to sky block values
define SKB_SIGS Memi[$1+79] # Pointer to sigma block values
define SKB_SKY Memi[$1+80] # Pointer to current sky block line
define SKB_SIG Memi[$1+81] # Pointer to current sigma block line
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