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Fig. 6.
Line-of-sight of X8 between 2006 and 2016. It is based on the blueshifted centroid Brγ (red data points) and HeI (blue data points) velocity of X8 with an error of ±20 km s−1 for every data point. The dashed line represents a linear fit to the blueshifted Brγ data points.
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