\begin{table}%t2
 %\centering
\par
\caption{\label{tab:eclipses}Times of eclipse for
SDSS~J1006 and the residuals with respect to the
linear ephemeris given in Sect.~\ref{sec:porb}.}
$$
\begin{tabular}{l r@{~$\pm$~}l r}
 \hline\hline
Cycle & \mc{Time of eclipse (HJD)} & Residual (d) \\
\hline
 --231 &  2~454~497.6338  &  0.0010   &    0.0001    \\
    0 &  2~454~540.5802  &  0.0010   &    0.0005    \\
    5 &  2~454~541.5091  &  0.0005   & $-$0.0002    \\
 1512 &  2~454~821.6805  &  0.0005   &    0.0000    \\
\hline \end{tabular}
$$
  \end{table}