**Table 2:** Parameters of $\gamma ^2$ Vel.
Parameter	Value	Refs.
$P_{\rm orb}$ /days	78.5	1
e	$\sim$ 0.33	1
$\dot{M_{\rm WC}}$ / $M_\odot$ yr^-1	$2.8\times 10^{-5}$	2
$\dot{M_{\rm O}}$	$1.8\times 10^{-7}$	3
$V_\infty$ (WC) km s^-1	1600	2
$V_\infty$ (O)	2500	3
$a/R_\odot$	300	1

References:
(1) Schmutz et al. (1997);
(2) De Marco & Schmutz (1999);
(3) De Marco et al. (2000).

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