From left to right: in blue, HD 106906AB b, relative positions of stars 1 and 3 with respect to their positions at the first epoch (2004/01/12). The 2015 positions are given in this paper, and the other positions are taken from Bailey et al. (2014). The curve shows the expected motion if the targets are background objects. In red, the expected positions, assuming the targets are background targets, at each epoch. We adopted very conservative error bars (30 mas) for all datasets in this diagram because of the uncontrolled variations during the exposures.
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