Fig. 2.
Normalised non-linear approximation (NLA; Sect. 5.2) of galaxies projected in the source and lens planes. The red curve illustrates the average NLA of galaxy images that can be seen as source or lens galaxies, the cyan curve shows the average NLA of the same galaxies once projected from lens to source plane, and the green curve shows the NLA of the same galaxies projected to lens plane.
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