\begin{table}%t3
\caption{The \hi\ properties of the total system, the tails and the central disc of NGC~4441. Heliocentric velocities are given.}
\label{n4441chap_himass}
%\centering
\small
\begin{tabular}{lc}
\hline\hline
 \hi\ properties & \\
\hline
{\bf Total system} & \\
 $v_{{\rm opt,hel}}$ (km\ s$^{-1}$)& 2674\\
 vel. range (km\ s$^{-1}$) & 2580--2900\\  
 $ F_{\rm HI}$ (Jy~km~s$^{-1}$) & 4.83\\
\mhi ($10^9$~\msun) & 1.46\\  
\mhi / \lb & 0.82\\
\hline
{\bf Central ring} & \\
major axis (\arcsec, kpc) & 32, 5.5\\
minor axis (\arcsec, kpc) & 19, 3.4\\
\mhi ($10^8$~\msun) & 4.2\\
\hline
{\bf Northern tail} & \\
vel. range (km\ s$^{-1}$) & 2700--2820\\
extent (centre-tip) (\arcmin, kpc)& 4.6, 48\\
centre -- clump (\arcmin, kpc) & 1.5, 16 \\
 \mhi ($10^8$~\msun) & 2.1\\
\hline
{\bf Southern tail}\\
vel. range (km~s$^{-1}$) & 2580--2640\\
extent (centre-tip) (\arcmin, kpc)& 4.0, 42\\
centre -- clump (\arcmin, kpc) & 1.7, 18 \\
\mhi ($10^8$~\msun)& 3.4\\
\hline
\end{tabular}
\end{table}