Relativistic reflection spectra for varying ring radius, x. (a) Solid lines show simulated reflected spectra for BH spin of a = 0.998, height of the primary source, h = 3r_g, and varying ring radius. Dashed lines show the primary spectra. Different colored lines correspond to different ring radii. The black line corresponds to the lamp post case, x = 0. The spectra are normalized setting BOOST = 1 in RELXILL, such that the reflection fraction is predicted from the geometry of the isotropically emitting primary source. Returning radiation is turned off. All other parameters of RELXILL are set to their default values, i.e., the iron abundance is A_Fe = 1, the inclination is i = 30°, the disk inner edge is at r_ISCO, the disk outer edge is at 400r_g, the photon index is Γ = 2, the disk ionization is log ξ = 3.1, the disk density log n = 10¹⁵ cm⁻³, and the electron temperature kT_e = 60 keV. (b) Ratio between the given reflected spectrum of the ring and the lamp post spectrum, re-normalized to the same flux.