\begin{table}%t2
\caption{Mean physical properties of simulated galaxies in pairs in the 3D catalog.}
\label{table2}
%\centerline
{
\begin{tabular}{lcccccccc}
\hline\hline
    & \multicolumn{2}{c}{Total Pair Sample}
&&
\multicolumn{2}{c}{Merging Pairs$^a$ }
&&  
\multicolumn{2}{c}{Interacting Pairs$^c$   }
\\
  \cline{2-3} \cline{5-6} \cline{8-9}
   & Passive & Active && Passive & Active && Passive &  Active \\
    \hline  
Age$^d$      &$10.54 \pm 0.01$ & $7.65\pm 0.02$ && $9.25\pm 0.02$ &  $7.5 \pm 0.05$&& $11.90  \pm 0.01$ & $7.80 \pm 0.10$ \\
$\beta $  &$0.36 \pm 0.04$& $3.50\pm 0.60$ &&  $0.36 \pm 0.05$ & 3.98 $\pm 0.07$ && $0.36 \pm 0.07$ & $2.09 \pm 0.29$\\
Gas    &$16  \pm 7$ & 27 $\pm 7$ && $20 \pm 3$ & $30 \pm 4 $ && $10 \pm 3$ &  $21\pm 4$\\
$V_{\rm cen}$  &$103 \pm 7$& 76 $\pm 7$ &&  $120 \pm 9$ & $90 \pm 8$&& $86 \pm 11$ & $62 \pm 15$\\
\hline
\end{tabular}}
$^a$ {Galaxy pairs with spatial separations $r < 100 \ {\rm kpc} \ h^{-1}$ }
$^b$ {Galaxy pairs with spatial separations $ r < 30 \ {\rm kpc} \ h^{-1}$. }
$^c$ {Galaxy pairs with spatial separations $30 \ {\rm kpc} \ h^{-1} < r < 100 \ {{\rm kpc} \ h^{-1}}$.}
$^d$ {Mean stellar age given in Gyr $h^{-1}$.}
$^e$ {Mean star formation enhancement.}
$^f$ {Percentage of the leftover gas in galactic systems.} 
$^g$ {Central circular velocity in ${\rm km \ s^{-1}}$.} 
\end{table}