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Fig. 9

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Best-fit of the apparent orbit of HIP11231, considering all the Campbell elements free except the period (142.33 days, from Barker et al. 1967). The black circles are the PIONIER astrometric measurements. The red dotted line is the best orbit with its line of nodes in dashes. The red crosses are the positions of the companion at the time of the PIONIER observations predicted by the best-fit orbit. The average residual distance is 60μas. The reference frame is centered on the primary star. North is up and east to the left.

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