\begin{table}%t3
\caption{Pulsar ephemerides. The first and last reference times~($t_{0}$) of
the timing solutions used in this analysis are given. For a~complete
list of the solutions and the corresponding pulsar parameters see the
references: 1: \citet{jbcrab}, 2: \citet{atnfarchive}, 3: \citet{J1747}.}
\label{table_timing}
\small%%\centerline

{
\begin{tabular}{ccc}
\hline\hline
Pulsar & $t_0$ [MJD] & References\\
\hline
B0531+21     & $52~929,\ldots,53~446$      & (1)   \\
B0833$-$45   & $53~123,\ldots,53~469$      & (2) \\
B1259$-$63   & $53~108,\ldots,53~386$      & (2) \\
J1420$-$6048 & 53~156, 53~493              & (2) \\
B1509$-$58   & $53~111,\ldots,53~385$      & (2) \\
J1524$-$5625 & 53~650                     & (2) \\
B1706$-$44   & 52~773, 52~915              & (2)   \\
J1826$-$1334 & 53~130, 53~449              & (2) \\
\hline
J1747$-$2958 & 52~613$^\star$             & (2)   \\
J1801$-$2451 & 52~503$^\star$             & (3)   \\
\hline
\end{tabular}}
\medskip
$^\star$ Valid timing information was not available for all data within the HESS~data set. 
\end{table}