\begin{table}%t1
%%%\centering
\par
\caption{Parameters of the Vela pulsar (\psr; \cite{Taylor}, unless specified otherwise).\label{t:param}}
$$
\begin{tabular}{ccccccccccc}
\hline\hline
\multicolumn{6}{c}{Observed}&&\multicolumn{4}{c}{Derived} \widerul\\
\cline{1-6}\cline{8-11}
$P$ &
$\dot P$ &  
$\mu_\alpha\cos(\delta)$,\ \  $\mu_\delta^a$ &
$\pi^a$ &
$l$, $b^b$ &
$DM^c$ &&
$\tau^d$ &
$B$ &
$\dot E$ & 
$d^{a}$ \wideru \\
%
ms &
$10^{-15}$ &
%&
mas yr$^{-1}$ &
mas &&
cm$^{-3}$ pc &&
Myr & 
G  &
erg s$^{-1}$ &
pc \widerul \\ 
\hline 
89 &
$125$ &
\twolines{$-37.2\pm1.2$}{$28.2\pm1.3$} &
$3.4\pm0.7$ &
\twolines{263\fdg6}{$-$2\fdg8} &
$68.2$ &&
0.011 &
$3.38 \times 10^{12}$ &
$6.9 \times 10^{36}$ &
$294^{+76}_{-50}$ \widerul\\
\hline
\end{tabular}
$$
\smallskip
\begin{tabular}{ll}
$^a$~Proper motion, parallax, and parallax-based distance (\cite{Caraveo}). & 
$^c$~Dispersion measure.\\
$^b$~Galactic coordinates.    &   
$^d$~Dynamical age. \\ 
\end{tabular}
\end{table}