Illustration of how the disc responds to the variable ionizing continuum for the set of parameters A = 95, δ = 10°, ϕ₀ = 96° and p = 25°. The line of sight is assumed to be inclined by i = 30° with respect to the normal to the disc in the direction of the negative x-axes. From left to right: The intrinsic emissivity map, the instantaneous illumination map, and the instantaneous brightness map. As can be noted, the impact of ℒ(t′) leads at the assumed time (t_obs = 0) to a greater enhancement of the BLR emissivity on the near side (i.e. closer to the observer) compared to the far side.