Left panel: 20 cm polarized intensity at ﹩\mathrm{RM}=60\,\mathrm{rad}\,{{\rm{m}}}^{-2}﹩. Right panel: same as Figure 1 (top right panel). Approximate contours of the globule seen in 92 cm data are overplotted in gray. The Faraday canal (see Section 3.1) is marked in green. The filled cyan circle shows the location of J1819+3845. Filled cyan triangles and squares show, respectively, the location of steep-spectrum and flat-spectrum sources with light curves that are presented in de Bruyn & Macquart (2015).