\begin{table}%T1
%\centering
\par
\caption{Clean bias simulation.}
\begin{tabular}{cc}
\hline\hline
\label{clean_bias_tab}
$N_{\rm iter}$(1) -- $N_{\rm iter}$(2) & median $\Delta S$ \\
\hline
 40~000--50~000        & ~0.5 $\mu$Jy/beam\\
 50~000--75~000        & ~1.0 $\mu$Jy/beam\\
 75~000--500~000       & 14.4 $\mu$Jy/beam\\
\hline
\end{tabular}
\end{table}