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Fig. 4 —Sensitivity as function of contrast (positive contrast = column on silicone cube, negative contrast = hole in silicone cube; compare with Fig. 1). Raters 1–4 had 18, 4, 6, and 2 years of experience, respectively, with analog mammography; raters 1–3 had 3 years of experience with digital mammography and rater 4, 2 years.