Orbital motion of T around the inner system. The coordinate system is centered on the P + S position, the red ellipses correspond to the astrometric positions of Sana et al. (2013) and the blue one to our AMBER data. The size of the ellipse is equivalent to 1σ uncertainty and the straight blue and red lines indicate the offsets of the measured astrometric positions from the best orbital fit. The continuous black line represents the best fit to the orbital motion.
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