Radio halo in A3558. Upper panel: ASKAP 887 MHz contours (after subtraction of the embedded individual sources; see Sect. 4.7) overlaid on the [0.5, 2.5]-keV XMM-Newton image (Rossetti et al. 2007). The resolution is 25.1″ × 20.9″, in p.a. 131.5°, and the rms is ∼35 μJy beam⁻¹. Contour levels start at ±0.15 mJy beam⁻¹ and are spaced by . The location of the cold front is indicated by the black arrows. Lower panel: MeerKAT 1.283 GHz contours after subtraction of the point sources and convolution with a restoring beam of 40.9″ × 40.4″, in p.a. 144.6°, overlaid on the pseudo-entropy (expressed in arbitrary units) obtained from the XMM-Newton observations (Rossetti et al. 2007). Purple and blue show low pseudo-entropy regions. The rms is ∼35 μJy beam⁻¹. Contour levels start at ±0.125 mJy beam⁻¹ and are spaced by .