Top panel: LOFAR 143 MHz image at a resolution of 34.9′′ × 26.6′′ (the beam is shown in the bottom left corner). Contours are spaced by a factor of 2 starting from 3σ, where σ = 650 μJy beam−1. The negative −3σ contours are shown in dashed lines. Dashed boxes denote the FOV of the other images reported along the paper. Bottom panel: XMM-Newton smoothed image with the LOFAR contours overlaid.
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