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Fig. 14.
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The position of HD 153919 and that of the individual members of NGC 6231 now (blue) and 2.2 Myr ago (green) in Galactic Cartesian coordinates. The uncertainty in the distance of HD153919 is represented by the magenta lines. The orange arrows show the movement of HD 153919 and NGC 6231 in 0.5 Myr.
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