Fig. 4
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Surface brightness model for the sources S1a and S1b (left) and S2 (right) in micro-Jansky per arcsecond squared. The green lines show the caustic. The blue, cyan, and magenta stars indicate the point source at the center of S1a, S1b, and S2 respectively. Source S2 is predicted to be at z = 2.7 by the single-lens plane model.
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