\begin{table}%t6
\caption{\label{class}Fraction of pairs~vs. the spectral classes of each galaxy in the pair for redshift $z \sim 0.5$ and $z \sim 0.9$. Pairs with $M_B < -18 - Q(z)$ and $r_{\rm p}^{\rm max}=100~{\rm kpc}/h$ are considered (202~pairs in total).}
%\centering
\small
\begin{tabular}{c c c c}
\hline\hline
  & Classification  & Fraction at $z\sim 0.5$ & Fraction at $z\sim 0.9$ \\ 
  \hline 
2 E/SO & $(1{-}1)$ & $11.8\%$ & $3.0\%$\\  
1 E/SO involved & $(1-X)$ & $29.4\%$ & $22.4\%$\\ 
1 E/SO or 1 early-Sp involved & $(1-X)+(2-X)$ & $47.1\%$ & $46.3\%$\\ 
\hline 
2 Irr & $(4{-}4)$ & $17.6\%$ & $16.4\%$\\
1 Irr involved & $(4-X)$ & $47.1\%$ & $47.8\%$\\
1 Irr or 1 late-Sp involved & $(3-X)+(4-X)$ & $76.5\%$ & $83.4\%$\\
\hline
\end{tabular} 
\end{table}