Reproduction of Figure 4 of Loi (2020b) using our implementation of the ray tracing described in Sect. 2 but with synthetic N and ρ profiles (see Appendix A.6 for details). Since θ₀ and α are not stated by Loi (2020b), they have been chosen manually (θ₀ = 11.0° and α = 81.0°). The remaining initial parameters are identical to Loi (2020b) (i.e., r₀ = 0.04 R_*, r_f = 0.01 R_*, B_cen = B_crit, cen, ω = 10 ω_dyn, and l = 1).