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Fig. D.2

image

Proper motion plot for background objects in the SPHERE/IRDIS field of view. The pink markers indicate the relative astrometric offsets to the first observational epoch that is plotted at the origin of the coordinate system (orange marker). The blue trajectory represents the simulated motion of a static background object at infinity and the white marker shows the relative positional offset of such an object at the time of our second observation.

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