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Visibilities of superpositions of ℓ = ±1 to ℓ = ±8 are plotted as a function of the relative misalignment of the mode and the mask, in units of the beam waist w0. ℓ = {1;5} means that blue stands for ℓ = 1 and ℓ = 5. The higher-order mode is more sensitive to misalignment, which means the visibility drops faster. The visibilities are obtained by simulating a misaligned mode at a mask, and fitting the result with the expected sinusoidal function.
