Source subtracted (with inner uv-cut of 2000λ, i.e. 100 kpc) images of A3528S with a taper of 30″. Radio contours are drawn at 3σ_rms × [ − 1, 1, 2, 4, 8, 16, 32], with σ_rms,410 = 260 μJy beam⁻¹, σ_rms,7000 = 144 μJy beam⁻¹, and σ_rms,1280 = 48 μJy beam⁻¹. The solid white regions show the location of the radio galaxies from the image with the same resolution, which are masked for the Halo-FDCA fitting (Boxelaar et al. 2021, see Appendix D). The dashed region is the area used to calculate the flux density of the candidate mini halo from the image.