Widths of the n = 0 (left panels) and n = 1 (right panels) images for all the possible emission configurations in the case of a Schwarzschild black hole (green), a RZ black hole with a₁|_ϵ = 0 = 0.1 (pink), and a RZ black hole with ϵ |_a1 = 0 = 0.1 (violet). The velocity of the disc is taken to be Keplerian for the upper panels, radial for the central panels, and mixed for the lower panels.