\begin{table}%t3
%\centering
\par
 \caption{Radial velocities relative $\beta$~Pic of ions measured in \mbox{absorption}.\label{radveltab}}
  \begin{tabular}{lcc}
   \hline\hline
   Ion & $\Delta v^{{\rm a}}$ &
   $\sigma_{\Delta v}^{{\rm b}}$ \\
       & km~s$^{-1}$ & km~s$^{-1}$ \\
   \hline
   Fe~I  & $-$0.0 & 0.3 \\
   Na~I  & $-$1.2 & 0.3 \\
   Ca~II$^{{\rm c}}$ & $-$0.3 & 2.1\\
   Ti~II & 0.2 & 0.8 \\
   Ni~I  & 0.4 & 0.4 \\
   Ni~II & 2.8 & 3 \\
   Cr~II & 2.2 & 3 \\
   \hline
 \end{tabular}
 \begin{list}{}{}
 \item[$^{{\rm a}}$] The positive direction is radially away from us, towards $\beta$~Pic.
 \item[$^{{\rm b}}$] Errors are relative only. An additional systematic error of
   0.5~km~s$^{-1}$ comes from the uncertainty in the system velocity of~$\beta$~Pic.
 \item[$^{{\rm c}}$] The radial velocity of Ca~II is measured on the infrared lines
 $\lambda$7291.47 and $\lambda$7323.89, and not the optically thick Ca~II H \& K~lines.
\end{list}
\end{table}