\begin{table}%t2
%\centering
\par
\caption{\label{t2}Absorption line column densities for component IV of the main system.}
\small
\begin{tabular}{lc|c}
\hline
\hline\\[-3.25mm]
Species              & Observed transitions                          & Log $N$ (cm$^{-2}$)   \\
\hline\\[-3.25mm]
SiII $^2$P$^{\circ}_{1/2}$ &  $\lambda$1526                                & $15.41 \pm 0.22 (S)$\\
SiII $^2$P$^{\circ}_{3/2}$ &  $\lambda$1533                                & $14.25 \pm 0.11   $ \\
MgI $^1$S$_0$          &  $\lambda$2026                                & $13.51 \pm 0.08   $ \\
ZnII $^2$S$_{1/2}$     &  $\lambda$2026,  $\lambda$2062,               & $12.79 \pm 0.06   $ \\
CrII a$^6$S$_{5/2}$    &  $\lambda$2056,  $\lambda$2062, $\lambda$2066 & $13.62 \pm 0.04   $ \\
NiII $^4$F$_{9/2}$     &  $\lambda$2166,  $\lambda$2217, $\lambda$2223 & $13.07 \pm 0.04   $ \\
MnII a$^7$S$_{3}$      &  $\lambda$2576,  $\lambda$2594, $\lambda$2606 & $13.13 \pm 0.03   $ \\
FeII a$^6$D$_{9/2}$    &  $\lambda$2249,  $\lambda$2260, $\lambda$2344,& $14.70 \pm 0.09   $ \\
                     &  $\lambda$2374,  $\lambda$2382, $\lambda$2586,&                     \\
                     &  $\lambda$2600                   &                     \\
FeII a$^6$D$_{7/2}$    &  $\lambda$2333,  $\lambda$2365, $\lambda$2389,& $13.76 \pm 0.03   $ \\
                     &  $\lambda$2396,  $\lambda$2599, $\lambda$2612,&                     \\
                     &  $\lambda$2626                   &                     \\
FeII a$^6$D$_{5/2}$    &  $\lambda$2328,  $\lambda$2349, $\lambda$2399,& $13.46 \pm 0.04   $ \\
                     &  $\lambda$2405,  $\lambda$2607, $\lambda$2618,&                     \\
                     &  $\lambda$2632                   &                     \\
FeII a$^6$D$_{3/2}$    &  $\lambda$2359,  $\lambda$2407, $\lambda$2411,& $13.32 \pm 0.04   $ \\
                     &  $\lambda$2614,  $\lambda$2631                &                     \\
\par
FeII a$^6$D$_{1/2}$    &  $\lambda$2411,  $\lambda$2414, $\lambda$2622,& $12.93 \pm 0.05   $ \\
                     &  $\lambda$2629                                &                     \\
FeII a$^4$F$_{9/2}$    &  $\lambda$2332,  $\lambda$2348, $\lambda$2360 & $14.04 \pm 0.05   $ \\
\hline
\end{tabular} 
\end{table}