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Histograms for each of the four evaluation methods. a. Distribution of ΔE values, b. Distribution of a∗ values, c. Distribution of 10CSh scores, d. Distribution of 5CSc scores. Based on the Shapiro–Wilk test results, the ΔE values and a∗ values showed a normal distribution, but the 10CSh and 5CSc scores did not. 5CSc: 5 Color Scales,10CSh: 10 Color Shades.
