Standard CIE color matching functions and illuminant spectral power distributions, tabulated at 5 nm intervals from 380 nm to 780 nm (81 samples).

Sources:

• CMFs — CIE 1931 2° and CIE 1964 10° standard observer colour matching functions, CIE 15:2004.

• D65, D50 — CIE 15:2004 Table T.1.

• Illuminant A — computed on demand from the Planckian radiator formula at T = 2856 K (see Color.Spectral.illuminant/1).

• Illuminant C, E — E is flat; C is computed from legacy tabulated values.

All values are relative; consumers should normalise by ∫ S(λ) · ȳ(λ) dλ (or the pre-computed y_integral/2 value) to get Y = 1 at the reference white.