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Fig. 2A —Results of visual analyses. Graphs show results of visual analyses by readers 1 (A), 2 (B), and 3 (C). For each compression level, left and right bars indicate thin and thick sections, respectively. Each grade of perceptual artifacts is represented by different shade of gray (grade 0, white; grade 1, light gray; grade 2, dark gray; and grade 3, black).