Fig. 2

Configurations of point mass perturbers causing a maximum difference in radii (red) or a maximum difference in arc lengths of the individual arcs (blue), excluding the origin point (a); Eq. (43) (b) and Eq. (44) (c) with respect to the alignments of the images and the perturber using rE = 2.0″, rE,p = 0.5″, and rp = 1.0″; Eq. (47) above s0 = 0.05″ varying the Einstein radius of the point mass from 0.2″, 0.15″, 0.1″ to 0.05″ (dark grey to white shaded area) (d).
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