Left: L-band FR image of the radio halo. The local rms of the image is 1σ = 6.6 μJy/beam; the beam size is indicated by the red ellipse. The overlaid contours are from the LR image, which has a local rms of 1σ = 7.1 μJy/beam. The beam size is 14.4″ × 11.3″, 141° pa and is the same for the UHF LR image. The contour levels are σ × [3, 6, 10]. Right: UHF-band FR image of the radio halo. The local rms of the image is 1σ = 13.2 μJy/beam; the beam size is indicated by the red ellipse. The overlaid contours are from the LR image, which has a local rms of 1σ = 17.6 μJy/beam. The contour levels are σ×[3,6,10].