\begin{table}%t2
%\centering
\par
 \caption{Selected gas emission lines, 3\arcsec\ SW in disk.\label{emitab}}
  \begin{tabular}{lcrccc}
   \hline\hline
   Line & $\lambda_{{\rm air}}^{{\rm a}}$ &
   Flux$^{{\rm b}}$ &
   $\sigma_{{\rm flux}}^{{\rm b}}$ &
   $E_{{\rm low}}^{{\rm c}}$ &
   $E_{{\rm high}}^{{\rm c}}$ \\
   \hline
   Fe~I        & 3820.425 & 61.3  & 2.5 & 0.859 & 4.103 \\
   Fe~I        & 3859.911 & 111.3 & 3.4 & 0.000 & 3.211 \\
   Na~I~D$_2$  & 5889.951 & 79.2  & 4.0 & 0.000 & 2.104 \\
   Na~I~D$_1$  & 5895.924 & 42.4  & 2.5 & 0.000 & 2.102 \\
   Ca~II~K     & 3933.663 & 12.0  & 1.0 & 0.000 & 3.151 \\
   Ca~II~H     & 3968.468 & 16.8  & 1.2 & 0.000 & 3.123 \\
   \hline
 \end{tabular}
 \begin{list}{}{}
 \item[$^{{\rm a}}$] Wavelength of transition in air, in units of \AA.
 \item[$^{{\rm b}}$] Flux in units of 
   10$^{-16}$~erg~s$^{-1}$~cm$^{-2}$~arcsec$^{-1}$; see Sect.~\ref{linemeasure}.
 \item[$^{{\rm c}}$] Lower and upper energy levels of transition, in units of eV.
 \end{list}
\end{table}