A ring-like source in Abell 548. Top: 7.5″ resolution MGCLS Stokes-I intensity image of the ring-like source in the Abell 548 field, centred at RA = 05^h46^m50.0^s, Dec = −25° 38′30.4″. The inset shows the Pan-STARRS gri-composite image. The ring hotspot is coincident with a background galaxy, indicated by the yellow arrow. Bottom: profile through the centre of the radio ring (green region in the top panel, with the profile starting from the northern end), showing that the structure is filled.