Effect of varying the electron density normalization n_e on the radio image at ν = 10¹¹ Hz for the a7SANE simulation. The lines of sight through the funnel (regions above and below the origins) are always optically thin at this frequency for this range of densities and their brightness scales as ﹩n_\mathrm{e}^2﹩ (see the text). In contrast, as the electron density increases, a larger part of the colder accretion disk (regions left and right of the origins) becomes optically thick, obscuring an increasing fraction of the funnel. The net effect is a dependence of the overall flux on electron density scale that is weaker than ﹩n_\mathrm{e}^2﹩ at this frequency.