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Fig. 6. —Graph shows alternative free-response receiver operating characteristic curves for all six observers on 1K monitor with voluntary postprocessing. Note that again observer 6 performed best with area under curve of 0.82 and observer 2 performed the worst with area under curve of 0.60. Observer 1, a = 0.71, b = 1.13, A_z = 0.6816. Observer 2, a = 0.29, b = 0.60, A_z = 0.5971. Observer 3, a = 1.07, b = 0.82, A_z = 0.7963. Observer 4, a = 0.83, b = 0.93, A_z = 0.7281. Observer 5, a = 0.69, b = 0.54, A_z = 0.7278. Observer 6, a = 1.27, b = 0.96, A_z = 0.8190.

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