Table 2: Adopted velocity dispersions $\sigma _U$, $\sigma _V$, $\sigma _W$ and asymmetric drift  $v_{{\rm ad}}$ for the young thin disk (YTD), the old thin disk (OTD) and for the thick disk (from Robin et al. 2003).
Population $\sigma _U$ $\sigma _V$ $\sigma _W$ $v_{{\rm ad}}$
  $({\rm km~s^{-1}})$ $({\rm km~s^{-1}})$ $({\rm km~s^{-1}})$ $({\rm km~s^{-1}})$
YTD (0.15-1 Gyr) 19.8 12.8 8.0 3.1
OTD (7-10 Gyr) 43.1 27.8 17.5 14.8
thick disk 67 51 42 53

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