Data
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806F: FLOOD_FILL's two flags for the run it is filling
Set once a seed point has been pushed for the row above, and for the row below, so that a stretch of empty pixels there is queued once rather than at every pixel; cleared again where the run meets ink.
SEEDED_ABOVE 806F DEFB $00 The row above
SEEDED_BELOW 8070 DEFB $00 The row below
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