\begin{table}%t1
\caption{Positional data on M~33.}\label{tab1}
\small%\centerline
{
\begin{tabular}{ l l } 
\hline
\hline
%& \\[-8pt]
Nucleus position~(J2000)$^{1}$    & RA = $1^{\rm h}33^{\rm m}51.0^{\rm s}$      \\
    &  Dec = $30^{\circ}39\arcmin37.0\arcsec$\\
Position angle of major axis$^{2}$   &23$^{\circ}$ \\
Inclination$^{3}$    & 56$^{\circ}$ \\
Distance$^{4}$~(1$\arcsec$~= 4~kpc)   & 840~kpc\\
\hline
\end{tabular}}
\medskip
$^{1}$ \cite{devaucouleurs_81}.
$^{2}$ \cite{Deul}.
$^{3}$~\cite{Regan_etal_94}.
$^{4}$ \cite{Freedman_etal_91}.
\end{table}