... gratingl Spectrum conditions: overall response is equivalent to tristimulus values X, Y, and Z calculated in corresponding functions under GB3978 standard ... ≤0.002l Palette system: l Color: X, Y, Z; Y, x, y; L*, a*, b*; L, a, b; L*, u*, v*; L*, c*, h ... *l Color difference: Δ E (L*a*b*); ΔE ...