Table 3: Mean heliocentric velocity components (and their standard deviations) of the young local associations before and after adding those stars belonging to TW Hya (see text).
Association $\overline{U}$ $\overline{V}$ $\overline{W}$ $N_{\rm k}$
  (km s-1) (km s-1) (km s-1)  
Tuc-Hor/GAYA -10.1(2.4) -20.7(2.3) -2.5(3.8) 44
adding stars -10.2(2.6) -20.5(2.3) -2.5(3.7) 47
$\beta $ Pic-Cap -10.8(3.4) -15.9(1.2) -9.8(2.5) 24
adding stars -11.2(3.3) -16.3(1.4) -9.2(1.6) 28
$\epsilon $ Cha -8.6(3.6) -18.6(0.8) -9.3(1.7) 5
adding stars -9.5(3.0) -19.2(1.4) -8.9(1.9) 9
HD 141569 -5.4(1.5) -15.6(2.6) -4.4(0.8) 2
adding stars -5.2(1.9) -14.3(2.5) -1.9(1.9) 8


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