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CIE chromaticity coordinates

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CIE chromaticity coordinates (In French coordonnées trichromatiques CIE) the coordinates of the CIE chromaticity chart: x = X / (X + Y + Z), y = Y / (X + Y + Z), z = Z / (X + Y + Z). Since x + y + z = 1, i.e. x and y already unequivocally describe chromaticity coordinates, the specification of z is dispensed with; instead, the standard color value Y (xyY) is specified as luminance factor A for the 2° standard observer.