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Fig. C.1.


Top: observed tangential velocity v as a function of Galactic longitude for populations II to VII. Middle: same as top panel, showing only population II. The dashed line is the expected relation for a non-expanding group of stars with systemic velocity 23 km s−1 (shifted vertically to overlap with the observed data). Bottom: corrected velocity (residuals of the observed velocities minus virtual contraction correction).

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