4 1 fiber Although long fine fibrils may extend from the body of a fiber, these fibrils are
considered part of the fiber if they seem to have originally been part of the
bundle.
5 Do not count If the object is ≤ 5 µm long, it is not counted.
6 1 fiber A fiber partially obscured by a particle is counted as one fiber. If the fiber ends
emanating from a particle do not seem to be from the same fiber and each
end meets the length and aspect ratio criteria, they are counted as separate
fibers.
7 ½ fiber A fiber which crosses into the graticule area one time is counted as ½ fiber.
8 Do not count Ignore fibers that cross the graticulate boundary more than once.
9 Do not count Ignore fibers that lie outside the graticule boundary