Balsillie et al. (2002) offer an equation for creating probability graphs. These are useful because the vertical axis is scaled in such a way that a sample with a Gaussian distribution plots in a straight line. Easy, computerized production of these graphs is clearly valuable, especially but not solely in studies of grain-size distributions, and the program is very convenient, given the widespread use of Excel. Moreover, the authors' graphics are commendably aesthetic and publishable.

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The authors' method involved splitting the distribution in half, because the cumulative % axis is scaled symmetrically around the 50th percentile, and then each half...

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