Fig. 4.
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Regions around the critical curve (red) fulfiling Eq. (25) for δg = 0.1 (blue) and δg = 0.2 (yellow) for the ARES simulation using a source redshift of zs = 1 (left), and zs = 9 (right). Regions with κ = 1 (green) mark areas containing multiple images that are not scaled and could therefore be used to break the mass-sheet degeneracy (see Sect. 3.3).
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