\begin{table}%t7 \caption{\label{TabLinesPost}Estimated FMK post-shock cooling region ionic abundances $n_{\rm ion}/n_{\rm O}$. (See text for details).} %\centerline {\small \begin{tabular}{lllllll} \hline\hline\noalign{\smallskip} Line & $I/I$(5007~\AA) & $T_{\rm e}$, $K$ & $\varepsilon$, cm$^3$/s & $\Delta t$, $10^3$ s & $n_{\rm ion}/n_{\rm O}$ & $n_{\rm ion}/n_{\rm O}$ (model)$^*$ {\large\strut}\\ \hline\noalign{\smallskip} {}[\ion{Si}{x}] 1.430~$\mu$m & 0.0016 & $2\times10^4$ & $2.9\times10^{-8}$ & 40 & $7\times10^{-5}$ & $5\times10^{-4}$ \\ {}[\ion{Si}{vi}] 1.964~$\mu$m & 0.004 & $1\times10^4$ & $3.1\times10^{-9}$ & 40 & 0.002 & 0.01 \\ {}[\ion{Mg}{v}] 5.608~$\mu$m & $<$0.003 & $6\times10^3$ & $9.0\times10^{-9}$ & 30 & $<$0.002 & $4\times10^{-4}$ \\ {}[\ion{Ar}{v}] 7.914 ~$\mu$m & 0.005$^{**}$ & $1\times10^4$ & $1.3\times10^{-8}$ & 60 & $8\times10^{-4}$ & $5\times10^{-5}$ \\ {}[\ion{Ne}{v}] 14.32 ~$\mu$m & 0.015 & $1\times10^4$ & $2.4\times10^{-9}$ & 50 & 0.06 & 0.002 \\ \hline \end{tabular}} \medskip $^*$ Estimated based on SD-200~model. The elemental abundances assumed to deduce the model ionic abundances with respect to oxygen are given in Table~\ref{TabAbund}; $^{**}$~this line is partly arising in the pre-shock region. As follows from Table~\ref{TabLinRat}, the post-shock region contribution is $I/I$(5007~\AA$)\approx0.0025$. \end{table}