Plan 9 from Bell Labs’s /usr/web/sources/contrib/rsc/pico/doug.pico

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lerp = x < X/3 ? 0 : x > 2*X/3 ? 255 : (x-X/3)*Z/(X/3)
r doug
rdoug = Z-doug[X-x,y]
(doug*lerp+rdoug*(Z-lerp))/Z
d
(rdoug*lerp+doug*(Z-lerp))/Z
d

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