\begin{table}%t3
%\centering
\par
\small\caption{Radial-velocity shift of selected photospheric lines.}\label{tab:radvel}
\begin{tabular}{cccc}
\hline\hline\noalign{\smallskip}
 Ion & $\lambda_{\rm  rest}$ / \AA & $\lambda_{\rm  observed}$ / \AA& $v_{\rm  rad}$~km~s$^{-1}$ \\
\noalign{\smallskip}\hline\noalign{\smallskip}
\ion{N}{v}   &1238.82  &1239.06  & 58.08 \\
\ion{N}{v}   &1242.80  &1243.04  & 57.89 \\
\ion{Si}{iv} &1393.76  &1394.07  & 66.68 \\
\ion{C}{iv}  &1548.19  &1548.48  & 56.16 \\
\ion{C}{iv}  &1550.77  &1551.06  & 56.06 \\
\ion{O}{v}   &1371.30  &1371.57  & 59.90 \\
\noalign{\smallskip} \hline\noalign{\smallskip} 
Mean   &         &         & 59.13 $\pm 1.62$\\
\hline
\end{tabular} 
\end{table}