Residuals of the subtraction of the eccentric theoretical model (left panels) and circular model (right panels) from the projected velocity in the simulation for i = 0° (top panels) and i = 30° (bottom panels). These maps were obtained assuming the upper emission surface to be Hτ₌₁ = 2.5H (as discussed in Sect. 5.3), and rescaling the simulations to have a binary with a_bin = 15 au, M_bin = 1 M_⊙, placed at a distance of d = 130 pc. Similarly to Fig. 9, we note that the convention about velocities in observations is that blue-shift of lines is associated with negative velocities, while red-shift is associated with positive velocities – for example, this implies that υ_z in this plot is opposite in sign with respect to that in Fig. 7. We note that the top right panel residual is obtained by subtracting υ_z,circ = 0 (as the circular case does not have vertical motion) from υ_z, thus this residuals map portrays the vertical velocity map on the τ = 1 surface for the case i = 0°. This highlights that the amplitude of the vertical oscillations reaches υ_z ~ 0.4 km s⁻¹ in the upper emission layer.