**Table 6:** Distribution parameters and their uncertainties from a 9-parametric Gaussian model applied to M 67 cluster and the field. $n_{\rm c}$ measures the volume of the cluster frequency function ( $n_{\rm f} = 1- n_{\rm c}$ ), $\mu _x$ and $\mu _y$ are the mean relative proper motions, $\sigma _{\rm c}$ , and $\sigma _{\mu _x}$ and $\sigma _{\mu _y}$ are the dispersions of the Gaussians fitted to the cluster and field distributions, and $\rho$ is the correlation for the field function (it fixes the orientation of the field elliptical function). The units of $\mu$ and $\sigma$ are mas yr^-1.
	$n_{\rm c}$	$\mu _x$	$\mu _y$	$\sigma _{\rm c}$	$\sigma _{\mu _x}$	$\sigma _{\mu _y}$	$\rho$
M 67	0.364	-0.59	0.49	0.89
	$\pm0.016$	$\pm0.07$	$\pm0.06$	$\pm0.05$
Field		0.02	3.31		9.00	8.63	-0.21
		$\pm0.10$	$\pm0.48$		$\pm0.03$	$\pm0.24$	$\pm$ 0.02

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