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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).
