\begin{table}%t1
\caption{\label{tab1}Depth and average image quality of each measurement.}                   
%\centering
 \small                         
\begin{tabular}{c c c}
\hline\hline
Band & Limiting magnitude & PSF ($''$) \\\hline
$B$ & 24.50 (8\rm $\sigma$) & 1.0 \\
$V$ & 28.75 (5\rm $\sigma$) & 0.1 \\
$R$ & 24.20 (8\rm $\sigma$) & 1.0 \\
$I$ & 23.50 (8\rm $\sigma$) & 1.0 \\
$K_{\rm S}$ & 22.5 (5\rm $\sigma$) & 1.0 \\
IRAC1 & 24.00 (5\rm $\sigma$) & 1.8 \\
IRAC2 & 24.00 (5\rm $\sigma$) & 2.0 \\
\hline
\end{tabular}
\end{table}