The proposed 10 deg cone fundamentals are based on the CIE XYZ 1964 10-deg color matching functions.
From Stockman, MacLeod and Johnson (1993).
Columns 2, 3, and 4: logarithms of proposed cone sensitivities based on the , and 10-deg CMFs of the CIE 1964 supplementary standard observer, derived from the following transformations, and adapted for small field application through the corrections described below:
The S-cone sensitivities have been extended at λ > 520 nm by using the following function:
(where λ is the wavelength in nm).
Stockman, MacLeod and Johnson (1993). Isolation of the middle- and long-wavelength sensitive cones in normal trichromats. Journal of the Optical Society of America A, 10, 2491-2521