\begin{table}%T1
%\centering
\small
      \caption{Total mass, number of particles $N$, particle mass $M$, and smoothing
        length $l$ for the different galactic components.}
         \label{tab:param}
         \begin{tabular}{lllll}
           \hline\hline
           %\noalign{\smallskip}
           ${\rm component}$ & $M_{\rm tot}\ ({M}_{\odot})$& $N$ & $M$\ $({M}_{\odot})$ & $l\ ({\rm pc})$ \\
           \hline
           ${\rm halo}$ & $4.8\times10^{10}$ & 32768 & $1.48\times10^{6}$ & 1200 \\
           {\rm bulge} & $1.7\times10^{9}$ & 16384 & $1.0\times10^{5}$ & 180 \\
           {\rm disk} & $8.3\times10^{9}$ & 32768 & $2.5\times10^{5}$ & 240 \\\hline
           \end{tabular}
\end{table}