\begin{table}%t2
%\centering
\par
\caption{\label{cloud_param}Summary of the parameters of the four molecular clouds identified in the FCRAO $^{13}$CO(1--0) emission.}
\begin{tabular}{c c c c c}
\hline\hline \noalign{\smallskip}      
Cloud & $\Delta~v$ & $d_{\rm FAR}$ & $d_{\rm NEAR}$ & $D_{\rm GC}$ \\
& (km~s$^{-1}$) & (kpc) & (kpc) & (kpc) \\
(1)&(2)&(3)&(4)&(5)\\
\hline                    
1 & 28--32 & 13.4 &  2.6  &  6.1       \\ 
2 & 33--48 & 12.6 &  3.4  &  5.4       \\ 
3 & 54--63 & 11.7 &  4.3  &  4.7       \\ 
4 & 64--73 & 11.3 &  4.7  &  4.3       \\ 
\hline
\end{tabular}
\tablefoot{Column~(1): the cloud; Col.~(2): the velocity interval of the emission; Col.~(3): the far distance; Col.~(4): the near distance; Col.~(5): the galactocentric distance.}
\vspace*{5mm}
\end{table}