Fig. 1
LOFAR HBA image contours (red) of VLSS J1431.8+1331 (centred on 148 MHz and with a bandwidth of 48 MHz) superposed on a Sloan Digital Sky Survey (SDSS) greyscale image of the galaxy cluster maxBCG J217.95869+13.53470. Eleven log-spaced contour levels are shown in red, spanning the surface brightness interval between −10 and 100 mJy beam-1, with a beam size of 
. The white cross marks the position of the bright cluster galaxy (BCG) AGN host, and the source components are labelled.
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