\begin{table}%T4
\par
\caption{\label{table:2}XO-1b timing measurements.}     
       \small%\centerline
{
\begin{tabular}{c c c c} 
\hline
\hline                         
$T_{\rm C}$ (HJD) & $\sigma_{T_{\rm C}}$ (d) & Epoch & Reference \\     
\hline                                    
2~453~127.03850  & 0.00580 & $-$173 & (1)\\
2~453~142.78180  & 0.02180 & $-$169 & (1)\\
2~453~150.68550  & 0.01060 & $-$167 & (1)\\
2~453~154.62500  & 0.00260 & $-$166 & (1)\\
2~453~158.56630  & 0.00340 & $-$165 & (1)\\
2~453~162.51370  & 0.00250 & $-$164 & (1)\\
2~453~166.45050  & 0.00250 & $-$163 & (1)\\
2~453~170.39170  & 0.00370 & $-$162 & (1)\\
2~453~229.51430  & 0.00450 & $-$147 & (1)\\
2~453~237.40430  & 0.00320 & $-$145 & (1)\\
2~453~241.34100  & 0.00670 & $-$144 & (1)\\
2~453~808.91700  & 0.00110 &    0 & (2)\\
2~453~875.92305  & 0.00036 &   17 & (3)\\
2~453~879.86400  & 0.00110 &   18 & (3)\\
2~453~883.80565  & 0.00019 &   19 & (3)\\
2~453~887.74679  & 0.00016 &   20 & (3)\\
{\bf 2~454~218.83331}  & {\bf 0.00114} &  {\bf 104} & {\bf This work (A)}\\
{\bf 2~454~222.77539}  & {\bf 0.00036} &  {\bf 105} & {\bf This work (B)}\\
{\bf 2~454~222.77597}  & {\bf 0.00039} &  {\bf 105} & {\bf This work (C)}\\
{\bf 2~454~226.71769}  & {\bf 0.00037} &  {\bf 106} & {\bf This work (D)}\\
\hline                                             
\end{tabular}}
\smallskip
References: (1)   \citet{wilson_etal06}; (2)  \citet{mccullough_etal06}; (3)  \citet{holman_etal06}.
\par
\end{table}