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Fig. 16.

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Secondary amplification peak of a source on a Keplerian circular orbit. The bolometric amplification of the first indirect and the second direct images of a source moving away from the observer (moving away from the caustic line) is plotted as a function of angular separation, ϕ, at different source distances, R. The solid lines correspond to the first direct images, and the dashed line corresponds to the first indirect images.

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