Equations: Area Fraction Fractionator

Estimated volume fraction

P(ref):	Points hitting reference volume
Y:	Sub-region
P(Y):	Points hitting sub-region

Estimated area

asf:	Area sampling fraction
a(p):	Area associated with a point

Howard, C. V., & Reed, M.G. (1998). Unbiased Stereology, Three-Dimensional Measurement in Microscopy. BIOS Scientific Publishers, 170–172.

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