Separation of sediment process populations is not possible using log-probability plots of grain-size concentrations, either by sieving or by direct measurement. Sedimentation diameters with other measurable grain parameters should be used. The significance of log-probability plots to illustrate grain-size distribution is still unverified. The distribution tails of such plots, though they are more visually accentuated, have a proportionally greater inherent error.

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