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Fig. 8


Top panel: position of the PSF centroid around event A, from epochs 208 to 225 (in blue), and highlighted in red, from ingress (213) to egress (220). Time arrow goes from top right to bottom left. Bottom panel: PSF centroid motion around the 4th degree polynomial fit of the main trend in the top panel. The modulation period is about 3 days.

This figure is made of several images, please see below:

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