Note 1 to entry: As the sum of the three chromaticity coordinates is equal to 1, two of them are sufficient to define a chromaticity.

Note 2 to entry: In the CIE standard colorimetric systems, the chromaticity coordinates are represented by the symbols x, y, z or x₁₀, y₁₀, z₁₀.

Note 3 to entry: The chromaticity coordinates have unit one.

Note 4 to entry: This entry was numbered 845-03-33 in IEC 60050-845:1987.