\begin{table}%t4
  %\centering
\par
  \caption{\label{abslines}Column densitity and outflow velocity of the most relevant X-ray absorption lines.}
  \begin{tabular}{lcc}
    \hline
    \hline
    Ion & $\log N_{\rm{ion}}$  & $v_{\rm{out}}$  \\
       & (cm$^{-2}$)  & (km s$^{-1}$) \\
    \hline
    \CVI{}     &  $17.16\pm0.11$ & $-420\pm60$ \\
    \NVI{}     &  $16.68\pm0.31$ & $-340\pm110$ \\ 
    \noalign{\smallskip}
    \NVII{}    &  $16.24\pm0.32$ & $-450^{\rm +246}_{-219}$ \\
    \noalign{\smallskip}
    \OV{}      &  $17.10\pm0.05$ & $-160\pm140$ \\
    \OVI{}     &  $17.00\pm0.07$ & $-410\pm130$ \\
    \noalign{\smallskip}
    \OVII{}    &  $17.23\pm0.07$ & $-510^{\rm +140}_{-260}$ \\
    \noalign{\smallskip}
    \OVIII{}   &  $17.40\pm0.13$ & $-70^{\rm +550}_{-100}$ \\
    \noalign{\smallskip}
    \NeIX{}    &  $<$16.2              & $\dots$ \\
    \NeX{}     &  $<$16.6                 & $\dots$ \\
    \noalign{\smallskip}
    \SiXI{}    &  $16.53^{\rm +0.70}_{-0.27}$ & $-990\pm190$ \\
    \noalign{\smallskip}
    \FeXVII{}  &  $16.31\pm0.16$ & $-265^{\rm +220}_{-190}$ \\
    \noalign{\smallskip}
    \FeXVIII{} &  $15.86\pm0.16$ & $-1250\pm315$ \\
    \hline
  \end{tabular}
\end{table}