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Fig. 4B —Box plots of deviations in six observers' classifications from actual value of gold standard as function of presence and size of artificial microcalcifications applied to individual quadrants on 65 films. Outliers are indicated by dots (). NA = not applicable (i.e., no microcalcifications in phantom quadrant). Data for each display medium are shown as follows: dark gray bars = analog films, striped bars = digital films, and light gray bars = monitor-displayed images. Criterion is size of detectable microcalcifications as function of their presented size.