\begin{table}%t1
%\centering
\par
\caption{rms noise levels and $5\sigma$ HI mass limits.\label{tab:res}}
\begin{tabular}{ccccc}
\hline \hline
$\theta_{\rm HPBW}$ & rms & $r_{\rm HPBW}$ & $M_{\rm HI}$\\
bmaj~$'' \times $~bmin$''$ & mJy/Bm & $h^{-1}_{71}$ kpc & $10^6$ $M_\odot$\\
\hline
$39.4 \times 37.7$ & 0.62 & 5.0 & 11\\
$26.1 \times 23.1$ & 0.52 & 3.3 & 8.8\\
$12.3 \times 9.9$  & 0.45 & 1.6 & 7.7\\
$2.9  \times 2.5$  & 0.30 & 0.4 & 5.0\\
\hline 
\end{tabular}
\end{table}