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Illuminant chromaticity profile as a function of lightness (L*). The vertical axis shows the Euclidean distance of the illuminant chromaticity from the lightness axis (a*, b*) = (0,0) for each a*-vs-b* plane normalized to the Euclidean distance for the achromatic points averaged across five lightness levels. The slanted lines indicate the illuminant chromaticity, and the intersection at 1.0 is found at approximately L* = 25. See the text for further details.
