| the tristimulus values of monochromatic stimuli of equal radiant power
NOTE 1 – The three values of a set of colour-matching functions at a given wavelength are called colour-matching coefficients (formerly spectral tristimulus values).
NOTE 2 – The colour-matching functions may be used to calculate the tristimulus values of a colour stimulus from its colour stimulus function φλ(λ).
NOTE 3 – In the CIE standard colorimetric systems, the colour-matching functions are represented by the symbols X and X
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