While the relationship between the amount of surface used to probe with and the length of B is known (surface per volume is estimated by times the boundary per area: for a derivation see Smith, C.S. To estimate surface you could use another surface as the probe, but when the two surfaces intersect it will create a line-segment that is called a boundary ( B).
This event is referred to as Q in the literature. To estimate length a surface probe is used and the event counted is the intersection of the string with the surface. In order to identify this unique point or leading edge, number estimation must be carried out in a volume either with physical sections along the z axis or with optical sections.
Email When estimating number, the ‘countable event’ is a unique point on the particle.
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