Positions of peaks and widths of the n = 0 (odd panels) and n = 1 (even panels) profiles for all the possible emission configurations in the case of a Schwarzschild black hole (green), a RZ black hole with a₁|_ϵ = 0 = 1.0 (pink), and a RZ black hole with ϵ |_a1 = 0 = 0.5 (violet). The velocity of the disc is taken to be Keplerian for first row, radial for second row, and mixed for the third row. Critical curves are represented as dashed lines.