\begin{table}%T1
%\centering
\small
\caption{\label{obs}Observation log of 61 Cyg, duration of MOS1/PN.}
\begin{tabular}{lccc}\hline\hline
Obs. ID & Obs. mode &  Obs. time  & Dur. (s)\\\hline
0041740101 & LW/thick & 2002-05-14T11:22-13:38 & 550/5000 \\
0041740301 & LW/thick & 2002-11-17T23:08-02:05 & 9270/7570 \\
0041740901 & LW/thick & 2003-05-12T14:44-17:14 & 7670/6200 \\
0041741001 & LW/thick & 2003-11-22T00:34-03:12 & 8170/6700 \\
0041741101 & LW/thick & 2004-05-01T12:41-19:21 & 14250/12790 \\
0043630101 & LW/thick & 2004-11-02T22:44-03:32 & 15970/13960 \\
0043630401 & LW/thick & 2005-04-23T13:24-16:27 & 9670/7670 \\
0202610401 & FF/thick & 2005-11-05T02:54-04:42 & 3540/5170 \\\hline
\end{tabular}
\end{table}