\begin{table}%T6
  \caption{\label{simulations}Parameters of encounters for KPG 468 (NGC~5953/54) 
from the Atlas of simulations of Howard et~al. (\cite{Howard1993}).}
%\centering
\par
\begin{tabular}{cccccc}
\hline \hline 
\multicolumn{6}{c}{NGC~5954}  \\
\cline{1-6}
Simulation  & Sense & $i$ &  $M_{\rm P}/M_{\rm g}$ & $r_{\rm min}/R_{\rm g}$ & H/D  \\
\hline
20 & Direct & 30 & 0.5 & 1.0 & 10 \\
21 & Direct & 30 & 1.0 & 1.0 & 10  \\
32 & Direct & 60 & 0.5 & 1.0 & 10  \\ 
33 & Direct & 60 & 1.0 & 1.0 & 10  \\    
\hline
\multicolumn{6}{c}{NGC~5953}  \\
\cline{1-6}
38 & Retrograde & 0 & 0.5 & 1.0 & 1  \\  
39 & Retrograde & 0 & 1.0 & 1.0 & 1  \\
44 & Retrograde & 0 & 0.5 & 1.0 & 10\\     
45 & Retrograde & 0 & 1.0 & 1.0 & 10 \\
 \hline
\end{tabular}
 \end{table}