\begin{table}%t3
\caption{\label{Q0100-t}Component structure of the $z_{\rm abs} = 2.309$ DLA system toward Q0100+13.} 
%\centerline
{\begin{tabular}{l c c c l c}
\hline \hline
No. & $z_{\rm abs}$ & $v_{\rm rel}^*$ & $b (\sigma_b)$ & Ion & $\log N (\sigma_{\log N})$ \\
   &               & km s$^{-1}$     & km s$^{-1}$    &     &                      \\ 
\hline 
\multicolumn{5}{l}{\hspace{0.3cm} Low-ion transitions} & \\
\hline
1 & 2.309027 & 0     & \phantom{0}5.6{\scriptsize (0.1)} & \ion{Fe}{ii} & 14.86{\scriptsize (0.01)} \\
  &	     &       &  			         & \ion{Zn}{ii} & 12.28{\scriptsize (0.01)} \\
  &	     &       &  			         & \ion{Cr}{ii} & 13.15{\scriptsize (0.01)} \\
  &	     &       &  			         & \ion{S}{ii}  & 14.85{\scriptsize (0.05)} \\
  &	     &       &  			         & \ion{Ar}{i}  & 13.99{\scriptsize (0.15)} \\
  &	     &       &  			         & \ion{P}{ii}  & 12.88{\scriptsize (0.08)} \\
  &	     &       &  			         & \ion{N}{i}	& 14.79{\scriptsize (0.08)} \\
  &	     &       &  			         & \ion{Mg}{ii} & 15.41{\scriptsize (0.07)} \\
2 & 2.309161 & $+$12 & \phantom{0}5.3{\scriptsize (0.1)} & \ion{Fe}{ii} & 14.61{\scriptsize (0.01)} \\
  &	     &       &  			         & \ion{Zn}{ii} & 12.03{\scriptsize (0.02)} \\
  &	     &       &  			         & \ion{Cr}{ii} & 12.96{\scriptsize (0.01)} \\
  &	     &       &  			         & \ion{S}{ii}  & 14.73{\scriptsize (0.08)} \\
  &	     &       &  			         & \ion{Ar}{i}  & 13.81{\scriptsize (0.08)} \\
  &	     &       &  			         & \ion{P}{ii}  & 12.55{\scriptsize (0.10)} \\
  &	     &       &  			         & \ion{N}{i}	& 14.65{\scriptsize (0.12)} \\
  &	     &       &  			         & \ion{Mg}{ii} & 15.06{\scriptsize (0.13)} \\
3 & 2.309443 & $+$37 &           14.1{\scriptsize (0.2)} & \ion{Fe}{ii} & 14.02{\scriptsize (0.03)} \\
4 & 2.309486 & $+$52 & \phantom{0}2.8{\scriptsize (0.3)} & \ion{Fe}{ii} & 12.96{\scriptsize (0.03)} \\
\hline 
\multicolumn{6}{l}{\hspace{0.3cm} Intermediate-ion transitions} \\
\hline
1 & 2.308980 & \phantom{0}$-$4 & \phantom{0}6.0{\scriptsize (1.9)} & \ion{Al}{iii} & 12.18{\scriptsize (0.12)} \\
  &          &                 &                                   & \ion{Fe}{iii} & $<$$13.28$ \\
  &          &                 &                                   & \ion{N}{ii}   & $<$$13.24$ \\
2 & 2.309093 & \phantom{0}$+$6 &           11.2{\scriptsize (1.2)} & \ion{Al}{iii} & 12.22{\scriptsize (0.08)} \\
  &          &                 &                                   & \ion{Fe}{iii} & $<$$13.22$ \\
  &          &                 &                                   & \ion{N}{ii}   & $<$$13.64$ \\
3 & 2.309498 &           $+$43 &           13.0{\scriptsize (1.9)} & \ion{Al}{iii} & 12.12{\scriptsize (0.05)} \\
\hline 
\end{tabular}}
\par
\smallskip
$^*$ Velocity relative to $z=2.309027$.
\end{table}