\begin{table}%t1
%%\centering

\par
\caption{\label{tab1}Log of M~67 data used in this work.}%
\par
\begin{tabular}{ccccc}
\hline \hline \noalign{\smallskip} 
Date&Filter&
\#Images~$\times$~Exp. time&Airmass& Image Quality\\ & &
(s) & $(\sec z)$ &(arcsec)\\  \hline  Feb. 22,
2007&$V_{\rm Bessel}$&
$1\times15,1\times330,17\times110$&
1.07--1.13&0.62--1.31\\  Feb. 27, 2007& $V_{\rm
Bessel}$&$25\times100$&1.07--1.10&0.84--1.26\\  Mar. 16, 2007&
$B_{\rm Bessel}$&$25\times180$&1.07--1.14&0.84--1.08\\ \hline
\end{tabular}
\end{table}