\begin{table}%T1
\caption{Parameters of the BATC filters and statistics of observations for
M~31.}\label{t1}
%\centerline
{
\begin{tabular}{cccccc}
\hline
\hline
 No.& Name & {cw(\AA)}$^{a}$ & Exp. (h) & {N.img}$^{b}$ & {rms}$^{c}$ \\
\hline        1  & BATC03 & 4210   & 01:00 & 03 & 0.015\\
        2  & BATC04 & 4546   & 05:30 & 17 & 0.009\\
        3  & BATC05 & 4872   & 03:30 & 11 & 0.015\\
        4  & BATC06 & 5250   & 02:20 & 12 & 0.006\\
        5  & BATC07 & 5785   & 02:15 & 07 & 0.003\\
        6  & BATC08 & 6075   & 01:40 & 05 & 0.003\\
        7  & BATC09 & 6710   & 00:45 & 03 & 0.003\\
        8  & BATC10 & 7010   & 03:00 & 12 & 0.008\\
        9  & BATC11 & 7530   & 02:00 & 06 & 0.004\\
       10  & BATC12 & 8000   & 04:00 & 12 & 0.003\\
       11  & BATC13 & 8510   & 01:30 & 05 & 0.004\\
       12  & BATC14 & 9170   & 05:50 & 18 & 0.003\\
       13  & BATC15 & 9720   & 04:00 & 12 & 0.009\\
\hline
\end{tabular}}
\medskip
$^{a}$ Central wavelength for each BATC filter.\\
$^{b}$ Image numbers for each BATC filter.\\
$^{c}$ Calibration error, in magnitude, for each filter as obtained from the standard stars.
\end{table}