\begin{table}%t6
%\centering
\par
\caption{Column~1: name of the scenario in the text -- Col.~2: time since last
interaction between the two clumps -- Col.~3: angle between the plane
of the sky and the line connecting the centres of the two clumps~--
Col.~4: relative velocity between the two clumps -- Col.~5: spatial
separation between the two systems -- Col.~6: state of the systems for the
possible solutions.\label{twobody}}
\begin{tabular}{lccccc}
\hline
\hline
Scenario & ${T}_0$ & $\alpha$ &  $V$ & $R$ & Solutions\\
 & [Gyr] & [deg]  & [km~s$^{-1}$] & [Mpc] &  \\
\hline
%\multicolumn{6}{c}{ }\\
a1 &12.6 & 84.3 & 89.4 & 7.5 & Outgoing \\
a2 &12.6  & 83.5 & 89.6 &  6.5 &  Incoming \\
a3 &12.6   & 2.2 & 2318.4 & 0.7 & Incoming \\
b & 0.3 & 4.9 & 1041.9 & 0.7 & Outgoing \\
c & 0.5 & 27.8 & 190.8 & 0.8 & Outgoing \\
d1 & 1.0 &  55.2 & 108.4 & 1.3 & Outgoing \\
d2 &  1.0   & 50.6 & 115.2 & 1.2 & Incoming \\
d3 &  1.0  & 4.7 & 1086.2 & 0.7 & Incoming \\
\hline
\end{tabular}
\end{table}