\begin{table}%t1
\par
\caption{\label{objects}{The observed neutron stars, their distances, and proper \mbox{motions}.}
}
%\centerline
 {\begin{tabular}{@{} l    c  c  c @{}}
\hline\hline
Object  & $D$ & $\mu_{\alpha}$ & $\mu_{\delta}$ \\
   &  [pc] & [mas yr$^{-1}$]& [mas yr$^{-1}$] \\
   &    &                &                 \\
\hline
PSR J0108-1431 &   130$^{a}$ & $<$$26$$^{a}$ & $<$$ 78$$^{a}$ \\
RX J0420.0-5022 &  $\geq $300$^{ass}$ & $<$$123$$^{b}$ & $<$$123$$^{b}$ \\ 
Geminga  &  $250^{+120 }_{-62}$$^{c}$ & $142.2 \pm 1.2$$^{c}$ & $107.4 \pm 1.2$$^{c}$ \\
RX J0720.4-3125  & $361^{+172 }_{-88}$$^{d}$ & $-93 \pm 1.2$$^{d}$ & $52.8 \pm 1.3$$^{d}$\\
RX J0806.4-4123 &  240$^{ass}$ & $<$$86$$^{b}$ & $<$$86$$^{b}$\\ 
RX J1856.6-3754 & $167^{+18 }_{-15}$$^{d}$ & $326.7 \pm 0.8$$^{e}$ & $-59.1 \pm 0.7$$^{e}$ \\
PSR J1932+1059 & $361^{+10}_{-8}$$^{f}$ & $94.03 \pm 0.14$$^{f}$& $43.37 \pm 0.29$$^{f}$\\ 
PSR J2124-3358$^{A}$ & $270 \pm 20$$^{g}$ & $-14.4 \pm 0.8$$^{h}$ & $-50  \pm 2$$^{h}$\\ 
RBS 1774$^{K}$& $\geq $300$^{ass}$ & $not$ $known$ & $not$ $known$\\
\hline
\end{tabular}}
\par
\smallskip
$^K$~1RXS J214303.7+065419;
$^A$~PSR J2124-3358 turned out to be too old for our substellar companion
  search. See   Appendix~\ref{psr2124} for a NIR limit of this neutron star;
$^a$~\citet{Mignani2003}; $^b$  $2\sigma$ limit of \citet{Motch2009};
$^c$~\citet{Faherty2007}; $^d$ \citet{Kaplan2007}; 
$^e$~\citet{Walter2002}; $^f$ \citet{Chatterjee2004}; 
$^g$~\citet{Gaensler2002};  $^h$ \citet{Hotan2006};
$^{ass}$  notes an assumed distance, which is a lower limit as indicated by estimations from X-ray measured hydrogen column density (e.g. \citealt{Posselt2007}), see also text.  
\end{table}