Tomographic map of V_Z from Fig. 3 extrapolated from Z = 1200 au to Z = 3000 au using the conical wind model from Fig. 9. Gray hatched regions named SU0-5 represent the locus of emissivity enhancements required to explain the cusps on-axis positions at V − V_sys = 3.73–5.32 km s⁻¹ (see Fig. B.1). White dots represent the solutions for the cusps at V − V_sys = 4.37 km s⁻¹. Red dotted lines indicate the height of the two extrema in specific angular momentum (from Fig. 3). The gray points located on the R = 0 axis represent the positions of jet knots observed by Podio et al. (2011). The red dots indicate the positions with associated errors of the ellipses identified in transverse PV diagrams (see Appendix C) and indicate that emissivity enhancements extend to the inner streamlines.