The spectral tristimulus values, ūλ, ῡλ, w¯λ, of the uniform space adopted by the CIE in 1959 have two bimodal functions, ūλ and w¯λ. Because in 1963 the CIE recommended data for a 10° matching field as well as the 1931 2° data, spectral tristimulus values are given for both systems. The chromaticity coordinates of several standard sources, the locus of Planckian radiators, and the spectrum locus are also reported.
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I. Nimeroff (1964) studied this question.
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