\begin{table}%t2
%\centering
\par
\caption{\label{tab2}Magnitudes of the Crab pulsar.}
\small \begin{tabular}{l c c c}
\hline\hline\noalign{\smallskip}
Source & Date & $H$-band & $K_{\rm s}$-band \\
\hline
M1 & 2007/09/30 & $14.14 \pm 0.02$ & $13.64 \pm 0.05$ \\
M1 & 2007/12/13 & $14.10 \pm 0.02$ & $13.58 \pm 0.05$ \\ 
\hline
\end{tabular}
\end{table}