The transmission coefficient, τ_p, profile data cube, calculated from the manufacturer’s theoretical profiles by use of Eqs. (10)–(12). a) The modulus for y_p = 0, |τ_p(x_p,0,λ;θ)|, superimposed for θ = 0°, 3°, and 6° as labeled. b) The pupil apodisations, |τ_p(x_p,y_p,λ_ℓ;6°)|, sampled at the wavelengths λ_ℓ indicated with the orange lines in a). c) The corresponding pupil phases, arg { τ_p(x_p,y_p,λ_ℓ;6°) } .