\begin{table}%t2
%\centering
\par
\caption{\label{tab2}Derived structural parameters.}
%\tiny
\renewcommand{\tabcolsep}{2.0mm}
\par
\begin{tabular}{cccccccccccc}
\hline\hline
Cluster&$\sigma_{\rm bg}$&$\sigma_0$&\rc&\rl&$\delta_{\rm c}$&$1\arcmin$&$\sigma_{\rm bg}$&$\sigma_0$&\rc&\rl\\
       &$\rm(*~\arcmin^{-2})$&$\rm(*~\arcmin^{-2})$&(\arcmin)&(\arcmin)& &(pc)&
$\rm(*~pc^{-2})$&$\rm(*~pc^{-2})$&(pc)&(pc)\\
(1)&(2)&(3)&(4)&(5)&(6)&(7)&(8)&(9)&(10)&(11)\\
\hline
Cr~197$^\dagger$&$2.17\pm0.02$&$5.0\pm1.0$&$4.8\pm0.8$&$40.0\pm4.0$&$3.3\pm0.5$&0.305&$23.3\pm0.1$&$97.9\pm20.9$&
   $1.5\pm0.3$&$12.2\pm1.2$\\
\par
Cr~197$^\ddagger$&$2.15\pm0.04$&$4.7\pm1.0$&$5.2\pm0.9$&$40.0\pm4.0$&$3.2\pm0.5$&0.305&$23.1\pm0.2$&$92.8\pm17.9$&
   $1.6\pm0.3$&$12.2\pm1.2$\\
\par
vdB~92$^\dagger$&$2.01\pm0.06$&$2.2\pm0.7$&$4.8\pm1.3$&$20.0\pm2.0$&$2.1\pm0.3$&0.402&$12.5\pm0.4$&$13.6\pm4.4$&
   $1.9\pm0.5$&$8.0\pm0.8$\\
\par
vdB~92$^\ddagger$&$1.97\pm0.06$&$2.7\pm0.6$&$5.0\pm0.9$&$20.0\pm2.0$&$2.4\pm0.3$&0.402&$12.3\pm0.4$&$17.0\pm3.6$&
   $2.0\pm0.4$&$8.0\pm0.8$\\
   \hline
\end{tabular}
\tablefoot{Column~6: cluster/background density contrast parameter ($\delta_{\rm c}=1+\sigma_0/\sigma_{\rm bg}$)
computed with the King-like fit parameters; Col.~7: arcmin to parsec scale. $\dagger$ background
level kept fixed; $\ddagger$ Background level allowed to vary.}
\end{table}