\begin{table}%t2
  \caption{Average mid-eclipse timings.\label{tab:timing}}
%\centerline
 {  \begin{tabular}{crccl}
    \hline\hline
    \noalign{\smallskip}
    Year & Cycle  &    BJDD      & (O$-$C)$^{\dagger}$  & Ref.\\
         &        & (+2400000 d) & ($\times 10^{-5}$~d)  &     \\ 
    \hline
     1978 &   1076 & 43807.18220(3) & $-23$ & 1  \\
     1982 &  20824 & 45261.56732(6) & $-7$  & 2, 3\\
     1983 &  25976 & 45640.99769(6) & $-9$  & 2, 3\\
     1984 &  30766 & 45993.76780(5) & $-8$  & 2  \\
     1991 &  63228 & 48384.50361(5) & $+23$ & 4  \\
     1994 &  79770$^{\ddag}$ & 49602.77584(5) & $+43$ & 5 \\
     1995 &  85616 & 50033.31752(4) & $+56$ & 6  \\
     1997 &  92628 & 50549.73159(2) & $+44$ & 6  \\
     2002 & 119542 & 52531.87205(3) & $+8$  & 7  \\
     2003 & 125130 & 52943.41261(4) & $+8$  & 7  \\
     2007 & 141152 & 54123.38773(3) & $-29$ & This work\\
    \hline
    \end{tabular}}
\par
    \smallskip
 $  ^{\dagger}$ O$-$C times with respect to the
      linear ephemeris of Table~\ref{tab:ephem}. 
$\ ^{\ddag}$ X-ray mid-eclipse timing. 
{References}: (1) Patterson (1981); (2)
      Zhang et~al. (1986); 
(3) Horne et~al. (\cite{Horne91}); (4) Wood et~al. (\cite{Wood95});
      (5) Mukai 
  et~al. (1997); (6) Ioannou et~al. (\cite{Ioannou99}); (7)
      Feline et~al. (\cite{Feline05}). 
\end{table}