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Fig. 3D —Bar graphs of number of correct positive findings (ordinate) according to raters 1–4 and images in series A (analog film), B (digital film), and C (digital monitor viewing) without scatter body made of ground meat (abscissa). Black solid horizontal lines indicate respective number of cubes with simulated masses. Each rater's stated degree of confidence is given on 3-item ordinal scale: Finding is certainly present (black), probably present (gray), or questionably present (white). 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. Category IV (volume, 13.1 mm³, 147 cubes).