Typical illumination pattern from an extended source produced through the same screen as in Fig. 4, with source radius r_s = 0.5 R_⊙, located at z₀ + z₁ = 1 kpc + 160 pc (R_s ≃ 53 000 km). The small-scale speckles are smeared, and only the larger scale fluctuations survive. The white square shows the restricted fiducial zone with margin of L_m = R_ref/2 + R_s from the borders. Grey scale ranges ± 20% around the mean intensity.