\begin{table}%t9
\caption{\label{tab:aperture_corrections}Aperture correction differences between the science and calibration exposures, in the sense science {\em minus} calibration exposures.}
%\centering
\small
\begin{tabular}{lc}
\hline
\hline
Band   & $\delta {\rm aper}$  \\
\hline
$g_M$  & $+0.0027 \pm 0.0003$ \\
$r_M$  & $+0.0026 \pm 0.0004$ \\
$i_M$  & $+0.0020 \pm 0.0003$ \\
$z_M$  & $+0.0020 \pm 0.0005$ \\
\hline
\end{tabular}
\end{table}