\begin{table}%t3
%\centering
\par
\caption{Tuning of the adaptive binning. Counts inside a time bin for a given source total counts.\label{tab3}}
\begin{tabular}{cc}
\hline\hline
Source total counts  & Counts inside a time bin \\
\hline
$~~~0$--$500$ & 15 \\
$~500$--$1000$ & 25 \\
$1000$--$2000$ & 35 \\
$2000$--$4000$ & 50 \\
$4000$--$6000$ & 80 \\
6000$<$      & 100 \\
\hline
\end{tabular}
\end{table}