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Fig. 2

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Same as Fig. 1 but for G23.389+00.185. The centre of motion (marked by the plus sign) from method 1, the (0,0) point in the top panel, is shifted by (−16.8016 mas, −73.825 mas) relative to the brightest spots listed in Table 1. The (0,0) point in the bottom panel is defined by the centre of the best-fitted ellipse in E1 (Table 2).

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