Table 5: Structural parameters.
Cluster $\sigma_{\rm bg}$ $\sigma_{\rm0K}$ $R_{\rm core}$ $R_{\rm lim}$ $R_{\rm tidal}$
  $\rm (stars~pc^{-2})$ $\rm (stars~pc^{-2})$ (pc) (pc) (pc)
(1) (2) (3) (4) (5) (6)
  Before differential-reddening correction
M 52 $3.2\pm0.2$ $49\pm13$ $0.80\pm0.14$ $8.0\pm1.0$ -
NGC 3960 $4.4\pm0.1$ $35\pm9$ $0.69\pm0.12$ $6.0\pm0.3$ -
  After differential-reddening correction
M 52 $3.7\pm0.2$ $45\pm10$ $0.91\pm0.14$ $8.0\pm1.0$ $13.1\pm2.2$
NGC 3960 $4.8\pm0.2$ $36\pm9$ $0.62\pm0.11$ $6.0\pm0.8$ $10.7\pm3.7$
Notes. We express King's profile as $\sigma(R)=\sigma_{\rm bg}+\sigma_{\rm0K}/(1+(R/R_{\rm core})^2)$.
$\sigma_{\rm0K}$ and  $R_{\rm core}$ were allowed to vary while  $\sigma_{\rm bg}$ was kept fixed.

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