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Mean achromatic settings reported by previous studies, along with those for the current study. The achromatic settings are denoted by symbols as listed in the legend, while the corresponding ambient illuminations are denoted by a × of the same color. The gray dotted line indicates the daylight locus. The achromatic loci for the Dark condition lie close to the equal-energy white point, and illuminant shifts along the daylight locus induce achromatic shifts in the same direction.
