\begin{table}%t1
%\centering
\par
\caption{\label{Table1}Properties of the particles in the simulations.}
\begin{tabular}{c c c c c}
\hline \hline\noalign{\smallskip}
& Particle & Particle & Particle & \\
& mass & mass & mass & length\\
& dark matter & gas & stellar & softening\\
& $M_{\sun}$~h$^{-1}$ & $M_{\sun}$ h$^{-1}$ & $M_{\sun}$~h$^{-1}$ &
[kpc~h$^{-1}$] \\
\hline\noalign{\smallskip}
group & $1.5 \times 10^8$ & $1.7 \times 10^7$ & $7.8 \times 10^6$ & 4\\
%\hline
cluster & $1.4 \times 10^8$ & $1.7 \times10^7$ & $7.3 \times10^6$ & 4\\
 \hline
\end{tabular}
\tablefoot{Particle mass resolution and softening length for the simulations.}
\end{table}