\begin{table}%t1
\caption{\label{tab1}The observed orbital periods and times of measurement for J1118+480.}
\small%\centerline
 {
\begin{tabular}{lcccl}
\hline \hline
$P\ (d)$ & $T_0$ (inf. conj.) in HJD & Orbital cycle $n$ & Reference$^{a}$\\
\hline
0.169930 $\pm$ 0.000004 & 2~451~868.8916 $\pm$ 0.0004 & 0 & 1\\
0.17013 $\pm$ 0.00010 & 2~451~880.1485 $\pm$ 0.0010$^{\rm b}$ & 66 & 2\\
0.1699339 $\pm$ 0.0000002 & 2~451~880.1086 $\pm$ 0.0004& 66 & 3\\
0.169937 $\pm$ 0.000001 & 2~452~022.5122 $\pm$ 0.0004 & 904 & 4\\
0.16995 $\pm$ 0.00012 & 2~453~049.93346 $\pm$ 0.00007 & 6950 & 5\\
\hline
\end{tabular}}
\medskip
$^{a}$ (1) Wagner et~al. (2001); (2) McClintock et~al. (2001); (3)~Torres et~al. (2004); (4)~Zurita et~al. (2002); (5)~\mbox{Gonz\'{a}lez Hern\'{a}ndez} et~al. (2008). \\
$^{b}$ $T_0$ time of maximum velocity.
\end{table}