VLA radio maps of J1000+12. Same as Fig. A.1. Contour levels start at 150 μJy beam⁻¹ (B-configuration) and 93 μJy beam⁻¹ (A-configuration) and increase with factor . Note that the extension that stretches ∼2″ south of the core is likely dominated by artefacts of the snap-shot observations, because a spike in the prominent pattern of the Point-Spread-Function (PSF) crosses the two bright regions in the centre.