Line-of-sight velocities resulting from the analytical vortex model of Wölfer et al. (2025). The model best describing the ¹³CO velocity residuals (Fig. 8) is shown in the upper left panel with employed parameters listed on the top of the figure. All the other panels vary one of these best-fit parameters to show how the resulting υ_l.o.s. changes. Position angle and inclination are taken from the ¹³CO best-fit Keplerian model (Table C.1). Parameters φ₀ and r₀ are the angle and radial center of the continuum crescent. The remaining parameters describe the radius of the ring of maximum velocity (r_v), the Gaussian width of the vortex ring (ω_v), its aspect ratio (χ, for χ = 1 the vortex is circular), and the maximum velocity of vortex rotation (v_max; see Fig. 3 of Wölfer et al. 2025 for a sketch).