Fig. 18.

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Detail of light curves of the point source in Keplerian circular orbit at R = 6M around the secondary amplification peak. The dashed line represents the first direct image, while the thick and thin continuous lines represent, respectively, the first indirect and second direct images. Top: light curves of both images forming the peak as well as the light curve of the non-amplified first direct image. Bottom: frequency shift factor profiles.
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