A plot of logarithmic semi-ellipticity η versus absolute magnification values for 38 known quadruply lensed quasars. The solid-color circles represent individual image magnifications, while solid-gray squares denote the summed magnification Σ∣μ∣ produced by the Witt–Wynne model. The black dotted line represents the predicted Finch SIQP flatter–fainter relation magnifications 〈μ₄〉.