Top panel: LOFAR image at 145 MHz convolved to 2.9-arcmin resolution. Contours represent −2, 2, 3, 5, 10, 20 × σ (5 mJy beam⁻¹). Bottom panel: LOFAR image at 145 MHz and 80 arcsec × 98 arcsec resolution. Contours represent −2, 2, 3, 5, 10, 20 × σ (3 mJy beam⁻¹). The black regions represent the boxes used to extract the flux density in the northern lobe and southern lobe respectively. The colour scale is set in Jy beam⁻¹.