\begin{table}%t5
\caption{Cumulative dust-corrected column density of Fe contained in the 
main absorber, $\log N_{{\rm Fe}, {\rm m}}$ (cm$^{-2}$).}\label{tb:column}
%\centering
\small
\begin{tabular}{@{}llllll@{}}
\hline
\hline
No.\rule[-5pt]{0pt}{15pt}
& $A$
& $B$
& $E0$
& $E1$
& Mean
\\
\hline
23--24\rule{0pt}{10pt}
& $15.44\pm0.18$
& $15.00\pm0.04$
& $15.03\pm0.05$
& $15.28\pm0.14$
& $15.19\pm0.21$
\\
23--28
& $15.54\pm0.17$
& $15.15\pm0.03$
& $15.16\pm0.04$
& $15.39\pm0.18$
& $15.31\pm0.19$
\\
\hline
\end{tabular}
\end{table}