Examples of positions on the magnification map where the computed line profile deformations fit the observed one with χ²/n_d.o.f. ≤ 1.2 and where the computed indices match the observed ones within the error bars. The exact positions are at the center of the circles, the radius of which represents the BLR half-light radius r_1/2 = 1.64 r_in = 0.25 r_E. The left panel shows the map convolved by the part of the BLR at the origin of the blue part of the line profile, while the right panel shows the map convolved by the part of the BLR at the origin of the red part of the line profile. The unconvolved magnification map is superimposed and seen as narrow caustics. The considered model is KD with i = 34°, q = 3, r_in = 0.15 r_E, and r_s = 0.03 r_E. The magnification map, computed with κ_⋆/κ = 3%, is oriented at θ = 60°. The size of the illustrated part of the map is 8 r_E × 8 r_E. Similar patterns are observed throughout the full map, as well as for the EW model with θ ≤ 30°.