Fig. 2.

Area above a given magnification for a single halo at zl = 0.4 with mass 2 × 1015 M⊙ and for a source at redshift zs = 4. The area computed in the image plane does not follow the μ−2 law at low and moderate magnifications ( μ < 40). At very high magnifications ( μ > 150), resolution effects break the μ−2 law, but the area can be safely extrapolated to high values of the magnification above μ ≈ 50.
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