Halo fit results for various frequencies. The first panel shows the data, with masked sources indicated by the green regions and the fitting region indicated by the grey region. The second panel shows the best-fit halo model (Eq. C.1) and the third panel the residual image. The last panel shows the same fit visualised in one dimension calculated from concentric annuli. (a) 144 MHz. (b) 46 MHz. (c) 23 MHz