VLA radio maps of J0853+38. Same as Fig. A.1. Contour levels start at 60 μJy beam⁻¹ (B-configuration) and 100 μJy beam⁻¹ (A-configuration) and increase with factor . Note that in the B-configuration map, the prominent streak that crosses the core from NE to SW across ∼3″ aligns with a spike in the point spread function (PSF), and is thus likely an artefact of the snap-shot observations.