\begin{table}%t2
\caption{\label{table_tres1}Overview of TrES-1 transits used in this work.}
%\centerline
 {\small \begin{tabular}{cccccc}
\hline\hline 
Epoch & Observed & O--C & 1-$\sigma$  & Calculated & Source \\
& transit time & [s]   & error      & timing & \\
& HJD-2~450~000    & & [s] & precision [s] & \\
\hline
  --4    & 3174.6864      & 60   & 35 & --  & 1 \\
  --1    & 3183.7752      & --63  & 43 & --  & 1 \\
   0    & 3186.8061       & 9    & 26 & --  & 1 \\
  20    & 3247.4075       & 2    & 35 & --  & 1 \\
  124   & 3562.5352       & 14   & 20 & 13 & 2 \\
  126   & 3568.5952       & --6   & 22 & 25 & 2 \\
  234   & 3895.8430       & --24  & 16 & --  & 3 \\
  235   & 3898.8734       & 8    & 12 & --  & 3 \\
  236   & 3901.9037       & 28   & 16 & --  & 3 \\
  254   & 3956.4445       & --15  & 14 & 20 & 2 \\
  255   & 3959.4760       & 107  & 17 & 23 & 2 \\
  357   & 4268.5418       & --44  & 14 & 17 & 2 \\
  358   & 4271.5716       & --66  & 17 & 16 & 2 \\
  359   & 4274.6028       & 32   & 18 & 17 & 2 \\
  386   & 4356.4142       & --24  &  9 & --  & 4 \\
  387   & 4359.4443       & --18  & 13 & --  & 4 \\
  388   & 4362.4742       & --31  & 17 & --  & 4 \\
  490   & 4671.5412       & --56  & 26 & 29 & 2 \\
\hline
\end{tabular}}
\medskip
Sources: 1) \citet{2005ApJ...626..523C}; 2)~This work; 3)~\citet{2007ApJ...657.1098W}; 4)~\citet{2009IAUS..253..446H}.
\end{table}