Table 1: Characteristic velocity dispersions ( $\sigma _{U}$, $\sigma _{V}$, and $\sigma _{W}$) in the thin disk, thick disk, and stellar halo, used in Eq. (1). X is the observed fraction of stars for the populations in the solar neighbourhood and $V_{\rm asym}$ is the asymmetric drift. The values fall within the intervals that are characteristic for the thin and thick disks, see Sect. 1.
  X $\sigma _{U}$ $\sigma _{V}$ $\sigma _{W}$ $V_{\rm asym}$
    [km s-1]

Thin disk (D)
0.94   35 20 16 -15
Thick disk (TD) 0.06   67 38 35 -46
Halo (H) 0.0015 160 90 90 -220


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