\begin{table}%t2
      \caption{\label{tab:param}Total mass, number of particles~$N$, particle mass~$M$, and smoothing
        length~$l$ for the different galactic components.}
               %%%\centering
\par
         \begin{tabular}{lllll}
           \hline\hline
           \noalign{\smallskip}
           {Component} & $M_{\rm tot}\ ({M}_{\odot}$)& $N$ & $M\ ({M}_{\odot}$) & $l$\ ({pc}) \\
           \hline
           {\rm Halo} & $2.4\times 10^{11}$ & 16~384 &        $1.4\times10^{7}$ & 1200 \\
           {\rm Bulge} &$8.2\times        10 ^{9}$ & 16~384 & $5.0\times10^{5}$ & 180 \\
           {\rm Disk} & $4.1\times10 ^{10}$ & 16~384 &        $2.5\times10^{6}$ & 240 \\
           \hline
        \end{tabular}
\end{table}