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Between-reader variation for trial of training methods[30]. The axes are as in Figure 2. The 95% range of difference in square roots for the 528 pairs is -15.2 to +9.2, which transform to the outer pair of curved dashed lines. The inner pair of dashed lines is the lower limit on this 95% range (-1.39 to +1.39), derived from the Poisson distribution.
