\begin{table}%t13
\caption{\label{table13}Similar to Table~\ref{table2} for the combined automatic data set from 93~months, 1998$-$2006.}
\par
%\centering
\par
\begin{tabular}{lllll}
\hline \hline \noalign{\smallskip}
$N$    &   $A \pm M_A$        &   $B \pm M_B$     &   $C \pm M_C$      & Remark     \\
\hline
54455  &   $14.467 \pm 0.006$ & $-3.01 \pm 0.03$  &   0                & 1 \\
50595  &   $14.529 \pm 0.005$ & $-3.03 \pm 0.02$  &   0                & 2 \\
50595  &   $14.499 \pm 0.006$ & $-2.54 \pm 0.06$  &   $-0.77 \pm 0.09$ & 3 \\
50595  &   $14.451 \pm 0.005$ & $-1.84 \pm 0.01$  &   $-1.84 \pm 0.01$ & 4 \\
\hline
\end{tabular}
\tablefoot {1. 1st filter, $C=0$. 2.~2nd filter, $C=0$. 3.~2nd filter, $C\ne0$. 4.~2nd filter, $B=C$.}
\end{table}