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The illumination chromaticities. (A) Illumination chromaticities plotted in the CIE xy chromaticity plane. (B) Illumination chromaticities plotted in the CIELUV chromaticity plane. The black open symbol marks the chromaticity of the reference illumination in each of the five conditions. The different axes of illumination-change are shown in the color that corresponds to the respective direction of change.
