Li(m, n) terms are summed and multiplied by 0, the skewness of the radial distribution can be obtained. A pear-shaped drop or a teardrop shape, for example, would provide a high value of skewness. However, the physical meaning of the individual L3(m, n) terms is not understood at present.

The statistical properties of the morphological features defined in Eq 15 and 17 have been discussed above. The second moment of the radial distribution (the radiance), which is defined in Eq 16, is interpreted as indicating the not-roundness (out-of-roundness) of the particle profile.

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