PD (top row) and PA (bottom row) predicted by the kynbbrr model for the disc emission assuming different values for the BH spin and for the system inclination (from left to right): a = 0.5 and i = 75°, a = 0.96 and i = 75°, a = 0.998 and i = 75°, and a = 0.998 and i = 50°. The different colours indicate different contributions of the returning radiation component, regulated by the albedo parameter. The vertical dashed lines highlight the 2–8 keV energy range. Here, the PA is defined with respect to the disc axis position angle χ₀.