\begin{table}%t2
\caption{H$_2$O line parameters obtained from Gaussian fits.}\label{gauss}
%\centering
$$
\begin{tabular}{c c r @{$\;\pm\;$} l r @{$\;\pm\;$} l}
\hline \hline
Source       & $\int{S~{\rm d}V}$  & \multicolumn{2}{c}{$V$} & \multicolumn{2}{c}{$\Delta V_{1/2}$} \ \ \\
             & (Jy~km~s$^{-1}$)   & \multicolumn{4}{c}{(km~s$^{-1}$)}         \\
\hline
NGC~2273    & 0.49 $\pm$ 0.09        &  1813 & 3     &  34 & 9        \\
UGC~5101    & 2.69 $\pm$ 0.13        & 11~721 & 7     & 267 & 15       \\
NGC~3393    & 3.96 $\pm$ 0.66        &  3151 &11     & 141 & 32       \\
             & 0.75 $\pm$ 0.20        &  3720 & 3     &  20 & 5        \\ 
             & 0.71 $\pm$ 0.22        &  4250 & 4     &  23 & 7        \\
             & 1.70 $\pm$ 0.22        &  4309 & 1     &  24 & 3        \\
\hline
\end{tabular}
$$
\end{table}