High- and low-resolution radio images of A1413 at 144 MHz. Left panel: high resolution 144 MHz image with 4″ × 6″ beam (shown in the bottom left corner) and noise σ_rms = 0.15 mJy beam⁻¹. Sources that have been subtracted are labelled with letters: two central AGNs A, B; one point-like north source C and one extended south source D. Right panel: low-resolution source-subtracted 144 MHz image with 35″ × 35″ beam (shown in the bottom left corner) and noise σ_rms = 0.27 mJy beam⁻¹. For both images, the contour levels start at 2σ_rms and are spaced with a factor of . The −3σ_rms contours are red, while 2σ_rms contours are dotted green.