Perpendicular to radial slices through each of the sources shown in Fig. 6 for the Δν = 4.0 distribution. Each of the perpendicular to radial slices are taken along Y at X = 213.6′′,542.9′′,750.1′′,936.6′′ for the DOP and polarization angle Ψ. The lines and colours are as in Figs. 6, 7. The DOP and the magnitude of the polarization angle Ψ remain symmetrical along the source perpendicular to radial direction.