\begin{table}%T1
\caption{Galaxy parameters.}
\label{m51parms}
%\centerline
 {
\begin{tabular}{ll}
\hline\hline
~& M~51 \\
\hline
Type$^{a}$     	            & SA(s)bcp \\
Radio Center :		    & \\
RA (B1950)$^{b}$ 	    & 13$^{\rm h}$27$^{\rm m}$46.3$^{\rm s}$ \\
Decl (B1950)$^{b}$          & +47$^{\circ}$27$'$10$''$   \\
RA (J2000)$^{b}$          & 13$^{\rm h}$29$^{\rm m}$52.7$^{s\rm }$ \\
Decl (J2000)$^{b}$          & +47$^{\circ}$11$'$42$''$   \\
$V_{\rm LSR}^{c,}$    	    & +464$\kms$                 \\
Inclination $i^{c}$ 	    & 20$^{\circ}$               \\
Position angle $P^{c}$      & 170$^{\circ}$ 		 \\
Distance $D^{d}$            & 9.7 Mpc                    \\
Scale           	    & 21.3$''$/kpc               \\
\hline
\end{tabular}}
\smallskip
Notes: 
$^{a}$~RSA (Sandage \& Tammann \cite{Sandage87});
$^{b}$~Turner \& Ho (\cite{Turner94}); 
$^{c}$~Tully (\cite{Tully74});
$^{d}$~Sandage \& Tamann (\cite{Sandage75}).
\end{table}