Table 1: Mean spatial coordinates and heliocentric velocity components of the young local associations and the Sco-Cen complex (in the latter case, data from Z99, M02 and S03). In brackets, the standard deviation of the sampling distribution. N is the number of known members in each association ($N_{\rm r}$ with distance determination and $N_{\rm k}$ with complete kinematic data).
Association $\overline{\xi^\prime}$ $\overline{\eta^\prime}$ $\overline{\zeta^\prime}$ $\overline{r}$ $\overline{U}$ $\overline{V}$ $\overline{W}$ Age N $N_{\rm r}$ $N_{\rm k}$
  (pc) (pc) (pc) (pc) (km s-1) (km s-1) (km s-1) (Myr)      
TW Hya -21(22) -53(23) $21_{(\;\;7)}$ 63(30) -9.7(4.1) -17.1(3.1) -4.8(3.7) 8 39 19 17
Tuc-Hor/GAYA -12(22) -24(11) $-34_{(\;\;8)}$ $49_{(\;\;8)}$ -10.1(2.4) -20.7(2.3) -2.5(3.8) 20 52 50 44
$\beta $ Pic-Cap -9(27) -5(14) -15(10) 35(11) -10.8(3.4) -15.9(1.2) -9.8(2.5) 12 33 24 24
$\epsilon $ Cha $-47_{(\;\;8)}$ -80(14) $-25_{(\;\;5)}$ 96(17) -8.6(3.6) -18.6(0.8) -9.3(1.7) 10 16 6 5
$\eta $ Cha $-33_{(\;\;2)}$ $-80_{(\;\;5)}$ $-34_{(\;\;2)}$ $93_{(\;\;6)}$ -12.2(0.0) -18.1(0.9) -10.1(0.5) 10 18 3 2
HD 141569 $-77_{(\;\;3)}$ $10_{(\;\;8)}$ $64_{(\;\;8)}$ $101_{(\;\;8)}$ -5.4(1.5) -15.6(2.6) -4.4(0.8) 5 5 3 2
Ext. R CrA -97(44) $-1_{(\;\;4)}$ -30(16) 102(47) -0.1(6.4) -14.8(1.4) -10.1(3.3) 13 59 7 4
AB Dor 6(21) 4(17) -12(16) 32(13) -7.4(3.2) -27.4(3.2) -12.9(6.4) 30-150 40 36 35
US Z99 -141(34) -22(11) 50(16) $145_{(\;\;2)}$       5-6 120    
M021 -138(27) -22(10) 49(12) 149(28) $-0.9\;\;\;\;~$ $-16.9\;\;\;\;~$ $-5.2\;\;\;\;~$   120    
S03         -6.7(5.9) -16.0(3.5) -8.0(2.7) 8-10 155    
UCL Z99 -122(30) -69(26) 32(16) $140_{(\;\;2)}$       14-15 221    
M021 -121(26) -68(21) 32(15) 145(24) $-7.9\;\;\;\;~$ $-19.0\;\;\;\;~$ $-5.7\;\;\;\;~$   218    
S03         -6.8(4.6) -19.3(4.7) -5.7(2.5) 16-20 262    
LCC Z99 -62(18) -102(24) 14(16) $118_{(\;\;2)}$       11-12 180    
M021 -61(14) -100(15) 14(15) 120(18) $-11.8\;\;\;\;~$ $-15.0\;\;\;\;~$ $-6.7\;\;\;\;~$   179    
S03         -8.2(5.1) -18.6(7.3) -6.4(2.6) 16-20 192    
1 M02 derived an internal velocity dispersion among individual stars of 1.33 km s-1 for US,
1.23 km s-1 for UCL and 1.13 km s-1 for LCC.

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