\begin{table}%t2
\caption{\label{grdelay}Time lag measurements from the AE3$g$-AE3$r$ events.}
%\centerline
{
\begin{tabular}{ccc}
\hline\hline
$\alpha$${^a}$ (d) & Time lag${^b}$ (d) & Probability of lags $\leq$0 (\%)\\                  
\hline
20 &3.0 $\pm$ 2.0 &11.6\\
25 &4.5 $\pm$ 2.5 &6.9\\
30 &4.0 $\pm$ 2.0 &7.5\\
35 &3.5 $\pm$ 2.0 &8.5\\
40 &3.5 $\pm$ 2.0 &9.3\\
\hline
\end{tabular}}
\medskip
${^a}$ We use the $\delta^2$ technique (see main text) and five values of the bin semisize $\alpha$. $^b$ All measurements are 1$\sigma$ intervals, and positive lags mean that the $r$-band event is delayed in relation to the arrival of the associated $g$-band event.
\end{table}