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Fig. 5A —Grading responses of three readers. Grading responses of reader 1 (A), reader 2 (B), and reader 3 (C). Three bars at each compression level represent average-intensity-projection (AIP) (left), thin-section (middle), and thick-section (right) images. Each gray shade indicates different grade for artifacts: white = grade 0, light gray = grade 1, dark gray = grade 2, and black = grade 3.