Table 6: Space velocities of the studied associations: mean value and standard deviation ( $\sigma$ ) resulting from a Gaussian model, in units of km s^-1.
Association U V W $U_{\rm LSR}$ $V_{\rm LSR}$ $W_{\rm LSR}$

mean $\sigma$ mean $\sigma$ mean $\sigma$ mean $\sigma$ mean $\sigma$ mean $\sigma$

US -6.7 5.9 -16.0 3.5 -8.0 2.7 2.4 5.0 -10.0 3.3 -0.9 2.8

UCL -6.8 4.6 -19.3 4.7 -5.7 2.5 3.2 4.2 -14.4 4.6 1.4 2.4

LCC -8.2 5.1 -18.6 7.3 -6.4 2.6 1.1 5.8 -13.6 5.6 1.1 2.4

Cha $^{\rm a}$ -11.9 7.7 -16.0 11.4 -8.6 5.8 -1.9 7.7 -10.8 11.4 -1.4 5.8

$^{\rm a}$ For the Cha OB association the mean velocities and the $\sigma$ presented are simple statistics, not derived from Gaussian fits.

Association	U		V		W		$U_{\rm LSR}$		$V_{\rm LSR}$		$W_{\rm LSR}$
	mean	$\sigma$	mean	$\sigma$	mean	$\sigma$	mean	$\sigma$	mean	$\sigma$	mean	$\sigma$
US	-6.7	5.9	-16.0	3.5	-8.0	2.7	2.4	5.0	-10.0	3.3	-0.9	2.8
UCL	-6.8	4.6	-19.3	4.7	-5.7	2.5	3.2	4.2	-14.4	4.6	1.4	2.4
LCC	-8.2	5.1	-18.6	7.3	-6.4	2.6	1.1	5.8	-13.6	5.6	1.1	2.4
Cha $^{\rm a}$	-11.9	7.7	-16.0	11.4	-8.6	5.8	-1.9	7.7	-10.8	11.4	-1.4	5.8