Ideal flux map at 1.245 μm for run 5 at 150 kyr assuming a distance of 140 pc (top). Red lines highlight the shadow feature and its opening angle in the upper right quadrant of the image. Corresponding ideal Q_ϕ map (middle). For illustrative purposes, r²-normalization is applied to the image to better highlight the regions far from the central star. SPHERE/IRDIS H band Q_ϕ observation (bottom) of the SU Aur system (Ginski et al. 2021).