Azimuthally averaged radial profiles ct_n6( ρ) (left) and azimuthal profiles ct_n6(r, ϕ) for r = 50, 80, 120 and 180 pix (right) corresponding to ρ = 0.18″, 0.29″, 0.43″, and 0.65″, respectively for the PSFs of HD 183143 shown in Fig. 8. Also indicated as gray shading are the standard deviations of the azimuthal points σ(ct_n6(r, ϕ). The location of the azimuthal cuts are indicated in the ct_6n(r)-panels and in Fig. 8.