\begin{table}%T5
\caption{\label{t:Param}Main parameters of HS~0837+4717.}
%%\centerline
\par
{
\begin{tabular}{lc} 
\hline \hline
Parameter                            & Value                \\ \hline
RA(J2000.0)                        & ~~08 40 29.84        \\
Dec(J2000.0)                        &~$+$47 01 09.1        \\
$A_{\rm B}$$^{(N)}$                  & 0.11                 \\
$B^{\rm tot}$                        & 18.18~$\pm$~0.10$^{(2)}$       \\
$(U-B)^{\rm tot}_0$                  &--0.41~$\pm$~0.14$^{(2)}$~~    \\
$(B-V)^{\rm tot}_0$                  &~~0.86~$\pm$~0.14$^{(1,2)}$    \\
$(V-R)^{\rm tot}_0$                  &--0.71~$\pm$~0.14$^{(1,2)}$    \\
V$_{\rm Hel}$ (\kms)                 & 12630$^{(2)}$           \\
Distance (Mpc)                       & 170.5$^{(2)}$           \\
$M_{\rm B}^0$$^{(3)}$                &  --18.1$^{(2)}$             \\
Opt. size (\arcsec)$^{4}$            &~$\sim$$8\times 7 ^{(2)}$     \\
Opt. size (kpc)                      & $6.5\times 6 ^{(2)}$         \\
12 + $\log$~(O/H)  \                    & 7.64~$\pm$~0.03$^{(2)}$  \\
$T_{\rm e}$(\ion{O}{iii}) (K)\       & 18~000$^{(2)}$         \\
$N_{\rm e}$  (cm$^{-3}$)\            &~$\la$400$^{(2)}$  \\
log~(N/O)\                            & --0.83~$\pm$~0.05$^{(2)}$\\
\ion{H}{i} int.flux$^{(5)}$          &~$<$0.31--0.43$^{(2)}$        \\
$M$(\ion{H}{i}) (10$^{9}~M$\sunn)    &~$<$2.5$^{(2)}$     \\
$M$(\ion{H}{i})/$L_{\rm B}$$^{(6)}$  &~$<$0.9$^{(2)}$    \\   \hline
\end{tabular}}
\smallskip
(1) -- ($B-V$)$_{\rm tot}^0$ corrected for redshift is 0\fm21. \\
(1) -- ($V-R$)$_{\rm tot}^0$ corrected for redshift is --0\fm02. \\
(2) -- this paper. \\
(3) -- corrected only for the Galactic extinction. \\
(4) --~$a \times b$ at~$\mu_{\rm B} =25$~mag/$\Box$\arcsec. \\
(5) -- for~$W_{\rm 50} \le$100--140~\kms, in Jy~\kms. \\
(6) -- in units ($M/L_{\rm B}$)\sunn. \\
($N$) -- data from the NED. \\
\end{table}