Best-fitting diffusion (left panels) and advection (right panels) models in strips b (south) and d (north and south). In each panel we show the vertical profiles. From top to bottom: 144 MHz non-thermal intensities, the 1570 MHz non-thermal intensities, and the non-thermal radio spectral index. Solid lines show the best-fitting models calculated with SPINNAKER. In each panel we also present the reduced for each observed profile and model profile.