\begin{table}%t3
\caption{Dependence of SF activity on the environment for the projected 2D catalogs.}
\label{table3}
%\centerline
{
\begin{tabular}{lccccccccccc}
\hline\hline
    & \multicolumn{3}{c}{Total Pair Sample$^a$
} &&
\multicolumn{3}{c}{Close Pairs Sample$^b$}
&&
\multicolumn{3}{c}{Control Sample$^c$  }
\\
  \cline{2-4} \cline{6-8} \cline{10-12}
   & Passive$^d$  & Active&$P/A$$^e$ && Passive & Active & $P/A$&& Passive &  Active&$P/A$ \\
    \hline
Total Samples     &66 & 34&--&& 55 &  45&--&& 68 & 32 &--\\
High density regions &43& 17 &2.53&&  37 & 18 &2.06&& 37 & 12&3.08\\
Low density regions     &23 & 17 &1.35&& 18  & 27 &0.67&& 31 & 20&1.55  \\
\hline
\end{tabular}}\medskip
\par
$^a$ {Galaxy pairs with spatial separations $r_{\rm p} < 100 \ {\rm kpc} \ h^{-1}$ and $\Delta cz < 350 \ { \rm km \ s^{-1}}$.}
$^b$ {Galaxy pairs with spatial separations $r_{\rm p} < 25 \ {\rm kpc} \ h^{-1}$ and $\Delta cz < 100 \ { \rm km \ s^{-1}}$. }
$^c$ {Galaxy pairs with spatial separations $r_{\rm p} > 100 \ {\rm kpc} \ h^{-1}$. }
$^d$ {Passive and Active columns represent percentages normalized to the total number of members in each Total Sample. We use log $\Sigma =-0.8$ to define high/density environments.}
$^e$ {Ratio between the percentage of passive ($P$) and active ($A$) galaxies.}
\end{table}