Polarization angle of the limb, plotted for multiple different values of γ_∞ and ϕ. The angles are measured relative to the TL ϕ_TL, which denotes the genuine projected edge of the jet. The blue stars denote the prediction of Equation (49) for the location of ﹩{\tilde{R}}_{{\rm{limb}}}﹩ and hence ﹩{\tilde{\beta }}_{{\rm{limb}}}﹩ (the point at which f^R = 0). For i = 17°, we have csci ≈ 3.42, which is why the swing switches from the receding edge to the boosted edge after the second panel.