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Fig. 2. —Average rank plotted as function of radiographic tube current (solid line) compared with theoretic expectation for ideal observer (dashed line). Error bars correspond to standard error at each value for five interpreters. For values equal to or greater than 160 mAs, observers have difficulty correlating image quality with milliampere-second setting, whereas for values of less than 160 mAs, observers can accurately correlate image quality with tube current.