\begin{table}%t3
\caption{\label{table_tres2}Same as Table~\ref{table_tres1}, for TrES-2.}
%\centerline
 {\small \begin{tabular}{cccccc}
\hline\hline \noalign{\smallskip}
Epoch & Observed & O--C   & 1-$\sigma$ & Calculated & Source\\
& transit time & [s]   & error     & timing           &	 \\
& HJD-2~450~000& & [s] & precision [s] & \\
\hline
    4   & 3967.5180       & 92   & 37  & 22 & 1 \\
   13   & 3989.7529       & 0    & 25  & --  & 2 \\ 
   15   & 3994.6939       & --15  & 27  & --  & 2 \\ 
   34   & 4041.6358       & --10  & 26  & --  & 2 \\ 
  140   & 4303.5209       & --72  & 26  & 20 & 1 \\
  142   & 4308.4613       & --169 & 39  & 22 & 1 \\
  274   & 4634.5828       & --184 & 26  & 24 & 1 \\
  276   & 4639.5232       & --257 & 27  & 21 & 1 \\
\hline
\end{tabular}}
\medskip
Sources: 1) this work; 2)~\citet{2007ApJ...664.1185H}.
\end{table}