\begin{table}%t1
%%\centering

\par
\caption{\label{tab_mod}Summary of the initial physical parameters characterizing the
simulations.}
\begin{tabular}{lccccccc}
\hline
\hline
\noalign{\smallskip}
Run & $\Delta t$ & $\nu$  & $M$    & $v_{\rm j}$   & $T_{\rm j}$ & $n_{\rm a}$  \\
      & yr         &        &        & [km s$^{-1}$] & [$10^4$ K]  & [cm$^{-3}$] \\
\hline\\[-3.2mm]
LJ0.5   & $0.5$    & $10$   & $1000$ & 10--4680   & $10^{4}$    & $5000$	\\
LJ2     & $2$      & $10$   & $1000$ & 10--4680   & $10^{4}$    & $5000$	\\
LJ8     & $8$      & $10$   & $1000$ & 10--4680   & $10^{4}$    & $5000$	\\	
LJ2RD   & $2$      & $10$   & $1000$ & 10--4680   & $10^{4}$    & $5000$	\\
HJ2     & $2$      & $0.1$  & $300$  & 10--1400   & $10^{2}$    & $50$	\\
\hline
\end{tabular}
\end{table}