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
Cooperation factor Wikipedia(Text) CC BY-SA