VLA radio images (greyscale) and Pan-STARRS optical images (contours) of the sample. The rms noise, σ, in the radio images is indicated (in μJy beam−1) in the bottom right corner, and the flux scale runs from −1σ to 5σ or 70 per cent of the maximum, whichever is greater (30 per cent for SDSS J0818+0601, SDSS J1320+1644, SDSS J1349+1227, and PS J1831+5447). Contours in the optical images begin at 1/8 of the maximum brightness and increase in multiples of |$\sqrt{2}$|. The bar in the bottom left corner of each plot represents 1 arcsec. The CLEAN beam is reproduced at the top right of each panel. Maps are centred at the coordinates given in Table 2. Crosses indicate radio components which have been identified and fitted. Gaia point sources are identified by blobs, and the Pan-STARRS maps have been re-centred by eye, typically by 100-200 mas, to agree with the Gaia (and radio) astrometric frame.
