\begin{table}%T4
%
\par
\caption{\label{tab:optshock}Measured emission-line ratios in 3C~326~N and expected ratios
  for a pure-shock model and a model assuming a shock and precursor
  \citep{allen08}.} 
\small
%\centering
\par
\begin{tabular}{lccc}
\hline \hline \noalign{\smallskip}
Line ratio & Observed & Shock & Shock and precursor \\ 
\hline
H$\beta$/H$\alpha$ & 0.26 & 0.33 & 0.33 \\ 
$[$OIII$~]$/H$\beta$ & 0.72 & 0.82 & 1.48 \\ 
$[$OI$~]$/H$\alpha$ & 0.24 & 0.22 & 0.13\\ 
$[$NII$~]\lambda$6584/H$\alpha$ & 0.77 & 0.68 & 0.47\\ 
$[$SII$~]$/H$\alpha$ & 0.61 & 0.52 & 0.32 \\
$[$SII$~]\lambda$$\lambda$6716,6731 & 1.32 & 1.23 & 1.24\\ 
$[$NeII$~]$(12.81~$\mu$m)/H$\alpha$ & 0.46 & 0.45 & 0.28 \\ 
$[$NeII$~]$(12.81~$\mu$m)/[NeIII](15.6~$\mu$m)\tablefootmark{a} & $>$1.8 & 2.2 & 0.73 \\
\hline 
\end{tabular}
\tablefoot{\tablefoottext{a}{$[$NeII$]$ and $[$NeIII$]$ fluxes are taken from
  \citet{ogle09}.}}
\end{table}