Fig. 12.
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Fermat potential differences evaluated at image positions of a multiply point source located at the center of the source galaxy. Given that the modeled data (Fig. 1) does not contain the multiply imaged point source, this can be seen as an intermediate scenario between that of a lensed quasar (i.e., centered on its host) and a lensed SN (i.e., has faded away).
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