Left: WSRT 346 MHz radio map imaged with Briggs weighting (robust = 0.0 in CASA). The noise level is σ_rms ≈ 0.5 mJy/beam. Contour levels are drawn at [1.5, 3.0, 9.0, 18, 36] mJy. There is no negative flux density below −1.5 mJy within the depicted area. The shape of the restoring beam is 108′′ × 52′′ with a position angle of 0°. Right: red contours: see the left image. Grayscale: GMRT 322 MHz radio map imaged with Briggs weighting (robust = 0.0 in CASA). The map is logarithmically scaled. Flux density cutoff is set to 3 × σ_rms with σ_rms ≈ 0.2 mJy/beam. The shape of the restoring beam (denoted with the blue ellipse) is 14′′ × 7′′ with a position angle of 73°.