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2016-09-14 17:35 GMT+02:00 Roberto Ierusalimschy <>:
>> "Frontier" feels more appropriate, but if we follow Dirk's suggestion
>> to avoid collision with %f then perhaps "edge" or "threshold" might be
>> a reasonable term.
> "Edge" sounds good, too.

That has two advantages.

1. Short.
2. Similar to image processing usage. One can say that
the default length calcaltion is an edge-detection algorithm.