\begin{table}%t1
\caption{Parameters of the galaxy model. The units of mass and
length are $2.2 \times 10^{11}~M_{\odot}$ and $40~{\mbox {kpc}}$, respectively.} \label{model}
%\centering
\par
\begin{tabular}{llrcr} 
\hline\hline
Component & Mass & Number of & Cutoff & Scale-\\
 & & particles & radius & length\\
\hline
 Bulge & 0.0625 & $0.05 N$ & 1.5 & 0.04168\\
 Disc & 0.1875 & $0.15 N$ & 0.4 & 0.0833\\
 Halo & 1.0 & $0.8 N$ & 6.0 & 0.1\\
\hline
\end{tabular}
\end{table}