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zROC data generated by sweeping a criterion across the 2-distribution non-Gaussian model shown in the middle right panel of Figure 2. The criterion was incremented in steps of 0.1. The only difference across the four zROC plots is the range over which the criterion was swept (from −5 to 5 in the top panel to −2 to 2 in the bottom panel). The straight lines represent least-squares fits, and the equation for each best-fitting line is shown on each plot.
