The observed polarization of the He i/Na i d blend (top panel) and Ca ii ir3 (bottom panel) on the Stokes q–u plane. The points are coloured coded according to their velocity with respect to the rest wavelength. Radial lines indicate the principal polarization angles for the LV (narrow lines) and HV (thick lines) components, for epochs at which they appear as separate features. Note the difference in scale between the top and bottom panels.