Intensity of the CO emission in a single velocity channel for all simulations listed in Table 1, at the points in time discussed in Section 3.2. The single channel intensity is computed by averaging five consecutive points in frequency space from the RADMC3D simulation, resulting in a channel width of ∆v = 0.2 km s⁻¹. Unless stated otherwise, the shown simulations have v_sys = 0.5 km s⁻¹ and k_min = 2π/50 AU.