Bottom: number of DM halos included in each spaxel of the 2D spatial profile of the stack (i.e. summed across the N_chan = 3 frequency channels of the stack aperture), averaged across cutouts. The actual catalogued DM halo is included in this count, but is outnumbered by more than an order of magnitude in the central spaxel alone. There are a significant number of DM halos in spaxels extending beyond the central spatial aperture. Top: spatial profile generated by integrating the ⟨n_halo⟩ map across the three channels making up the stack aperture in the RA direction. Unlike the regular simulations, this is not mean-subtracted, and thus the baseline number of halos is high. A double-Gaussian fit to this profile is shown in orange.