\begin{table}%t2
 \small
\caption{Observed features of the X-ray dim radio-quiet isolated neutron stars$^{\ddag\ddag}$.\label{tab:xdins_table}} 
%\centerline
 {\begin{tabular}{cccccccccc}
\hline\hline
\noalign{\smallskip}
ID & Period (s) & $\dot{P}_{-13}$ (s/s) & $B_{p\dot{p}}$ & $L_{\rm x}$ (erg s$^{-1}$) &
$kT_{\rm BB}$ (eV) & $E_{\rm EW}$ (eV) & $E_{\rm cen.}$ (eV) & 
Optical excess &  $R_{\rm bb}$ (km) \\
\hline
  RX J0420.0-5022            &  3.45   & $<$92  & -- & $2.7\times 10^{30}$ & 44  & --  &   --  &   $<$12   &   -- \\ 
  RX J0720.4-3125            &    8.39  & 0.69  & 3.93e13& $2.6\times 10^{31}$ &  85-95 & 40  &   280  &    $5$    &       4.4--4.8    \\  
  RX J0806.4-4123             &   11.37  & $<$18  & -- & $5.7\times 10^{30}$ & 96  & --  &  306--430   &     --   &        --    \\  
 RBS 1223                            &  10.31    &  $1.12$  & 5.52e13& $5.1\times 10^{30}$ &  86 &  150 &  230-300   &    $<$5   &  -- \\  
 RX J1605.3$+$3249         &    --    &  --  & -- & -- & 96 &  120  &  450-480   &  $<$14     &   --\\  
 RX J1856.5$-$3754          &    --   &  --  & -- & -- & 60  &  --  &  --   &   5--7    &    4.4 \\ \hline
 RBS 1774                             &    9.44   & --  & -- & -- & 101  & --  & $\sim$700   &   --     &   --\\ \hline
%\enddata
\end{tabular}}
\par
{\smallskip}
$^{\ddag\ddag}$ See Haberl (2005) and references therein.
\end{table}