Fig. 2.
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Overdensity as a function of the position. Magenta line: past orbit of the CM. Magenta star: current position of the CM. Pink arrow: velocity of the CM. Red arrow: mean velocity of the wake or collective. Green arrow: mean velocity of a bin of 15 kpc. Cyan star: position of the galactic centre. Top panel: orbit plane with |z*|< 10 kpc. Bottom panel: x* − z* plane (perpendicular to the orbit plane).
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