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Fig. 4.

image

Gaia DR2 radial velocity as a function of distance for the stars in each population identified in this study. κr: slope of the radial velocity gradient with distance (×10−2 km s−1 pc−1). μ: mean radial velocity (km s−1). σ: standard deviation (km s−1). σ/: statistical uncertainty (km s−1).

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