\begin{table}%T8
%\centering
\par
 \caption{Velocity shifts for selected lines in the 103-spectrum composite.
   Error estimates are deduced from
   fitting same profiles with different fitting parameters (see text),
   and the listed shifts are means of the three measurements.
   Laboratory wavelengths are from Martin et al. (\cite{nist}). 
   Last column: comments on line strength and profile.
    \label{tab-systemrvs}
  }
  \begin{tabular}{l l@{~~~~}c@{~~~~}c l}
     \hline
     \hline
     \noalign{\smallskip}
     $\lambda_{{\rm lab}}$(air) & Ident. &$\Delta\lambda$ &$\Delta 
       {{\rm RV}} \pm\sigma$ & Notes \\
     \AA          &        &\AA           & \kms       & \\
     \hline
     4437.554 &   \ion{He}{i}  & --0.199& $-13.4\pm1.4$& 3.5\%, blended region \\
     4552.622 &   \ion{Si}{iii}& --0.222& $-14.6\pm0.7$& 9\%                   \\
     4567.840 &   \ion{Si}{iii}& --0.235& $-15.5\pm0.8$& 8\%                   \\
     4574.757 &   \ion{Si}{iii}& --0.274& $-18.0\pm0.3$& 4.5\%                 \\
     4590.974 &   \ion{O}{ii}&  --0.225& $-14.7\pm1.3$& 5.5\%                  \\
     4596.177 &   \ion{O}{ii} &  --0.280& $-18.2\pm0.7$& 5\%, multicomponent\\
     4661.632 &   \ion{O}{ii} &  --0.271& $-17.4\pm1.0$& 5\%, slight asymm.    \\
    \hline
    \noalign{\smallskip}
   \end{tabular}
\end{table}