Orientation of the non-systemic momentum flux through a spherical shell with radius R_bound as a function of time. The differently colored lines denote different simulations from Table 1. Unless stated otherwise, the shown simulations have v_sys = 0.5 km s⁻¹ and k_min = 2π/50 AU. The round markers show the physical time of the snapshot used for the synthetic observations. The cross markers show the physical time of the snapshots used for the time series in Fig. 8. The left panel shows the azimuthal angle θ, and the right panel shows the polar angle φ.