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Figure 7b. ROC curves for the six observers for two-view reading of the masses (a) without CAD and (b) with CAD. (a, b) R1 = reader 1, R2 = reader 2, R3 = reader 3, R4 = reader 4, R5 = reader 5, R6 = reader 6. All six observers achieved an increase in the area under the ROC curve, A_z, with CAD.