Cooperation factor
From Infogalactic: the planetary knowledge core
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In facsimile systems, the cooperation factor is the product of the total image scanning length and the scanning density, given by CF = L σ, where L is the scanning line length and σ is the scanning line density, both in compatible units.
For example, a 20 cm line and a line density of 6 scanning pitches per centimeter would yield a cooperation factor of 120.
References
This article incorporates public domain material from the General Services Administration document "Federal Standard 1037C".