\begin{table}%tA.1
\par
\caption{\label{tab_mod_appendix}{Model parameters and results.}}
%\centerline
 {\begin{tabular}{lrccccc}
\hline\hline
\multicolumn{2}{l}{Model$^a$}  & D105  & D135  & D160  & S180  & S310  \\
\noalign{\vskip3pt} \noalign{\hrule}\noalign{\vskip3pt}
\multicolumn{2}{l}{$L$ ($L_{\odot}$)}  & 2423  & 2550  & 2420  & 2080 & 2084  \\
\noalign{\vskip2pt} %\multicolumn{2}{l}{\ \ \ \ \ {\it Nebular parameters}$^{a}$}&&&&&\\
\noalign{\vskip3pt} \multicolumn{2}{l}{$R_{\rm in}$ (10$^{17}$~cm)} & 1.00 & 1.00 & 1.00 & 2.58 & 1.82\\
\multicolumn{2}{l}{$R_{{\rm out}}$(thin) (10$^{17}$~cm)}  & 2.08  & 2.15  & 2.14  & 2.97 & 2.06\\
\multicolumn{2}{l}{$R_{{\rm out}}$(thick) (10$^{17}$~cm)} & 2.91  & 2.98  & 2.80  &  --  &  -- \\
\multicolumn{2}{l}{$f^{{\rm cov}}$(thick)}     & 0.027 & 0.013 & 0.012 & --   & --  \\
\multicolumn{2}{l}{$N_{{\rm in}}$(H) (\cmt)} & 1200  & 1200  & 1200  & 1000  & 1600\\
\multicolumn{2}{l}{$\langle$\de$\rangle$ (\cmt)}  & 1942  & 1860  & 1870  & 1590 & 2940 \\
\multicolumn{2}{l}{$\langle$$T$(H$^+$)$\rangle$ (10$^4$~K)} & 1.752  & 1.780  & 1.781 & 1.730 & 1.669 \\
\multicolumn{2}{l}{$\tau_{{\rm c}}$}         & 1.00  & 1.75  & 1.65  & 0.90  & 0.90\\
\multicolumn{2}{l}{$\tau$(thin) (13.6~eV)} & 0.50  & 0.79  & 1.09  & 1.37  & 3.40\\
\multicolumn{2}{l}{\hb(thin) fraction}      & 0.73  & 0.87  & 0.89  & 1.00  & 1.00 \\
\multicolumn{2}{l}{$M_{{\rm ion}}$ (10$^{-2}$~$M_{\odot}$)} & 6.83 & 7.02 & 6.85 & 6.11 & 3.37\\
\noalign{\vskip2pt} \multicolumn{2}{l}{He/H} & 0.122 & 0.108 & 0.105 & 0.120 & 0.110\\
\multicolumn{2}{l}{C/H ($\times$10$^{-5}$)} & 13.0  & 22.0  & 26.5  & 11.7  & 25.0\\
\multicolumn{2}{l}{N/H ($\times$10$^{-5}$)} & 1.30  & 2.56  & 3.10  & 1.42  & 1.24\\
\multicolumn{2}{l}{O/H ($\times$10$^{-5}$)} & 8.35  & 17.5  & 22.0  & 7.72  & 8.26\\
\multicolumn{2}{l}{Ne/H ($\times$10$^{-5}$)} & 1.22 & 2.57  & 3.49  & 1.29  & 1.50\\
\multicolumn{2}{l}{S/H ($\times$10$^{-7}$)} & 14.9  & 17.3  & 19.7  & 12.7  & 11.4\\
\multicolumn{2}{l}{Ar/H ($\times$10$^{-7}$)} & 3.40 & 3.96  & 4.55  & 2.90  & 2.60\\
\multicolumn{2}{l}{Fe/H ($\times$10$^{-7}$)} & 4.00 & 4.00  & 4.00  & 4.00  & 4.00\\
\noalign{\vskip3pt} \textit{Lines}  & $I_{{\rm obs}}$$^{b}$  & \multicolumn{5}{c}{\textit{Predicted intensity / Observed intensity}}\\
\noalign{\vskip3pt}
\ha\ 6563   & 284.  & 0.99  & 0.99  & 1.00  & 1.04  & 1.06\\
\hg\ 4340   & 50.4  & 0.94  & 0.94  & 0.94  & 0.94  & 0.94\\
\hd\ 4101   & 27.7  & 0.96  & 0.97  & 0.97  & 1.00  & 1.01\\
\hei\ 5876   & 2.8  & 2.56  & 1.00  & 0.75  & 1.13  & 0.74\\
\heii\ 4686  & 98.1 & 0.88  & 1.00  & 1.00  & 0.98  & 0.91\\
\fciii\ 1908 & --  & (591)  & (573)  & (582) & (625) & (1267)\\
\civ\ 1549   & --  & (1239) & (1864) & (1978) & (667) & (835)\\
\civ\ 4658$^{c}$ & 3.0: & 0.12 & 0.18 & 0.22 & 0.12  & 0.09\\
\fnii\ 6584   & 9.4  & 1.00  & 1.00  & 1.00  & 1.00  & 1.00\\
\foi\ 6300   & $<$2. & 0.64  & 0.74  & 0.77  & 0.03  & 0.03\\
\foii\ 3727   & 26.8 & 1.00  & 1.00  & 1.00  & 1.00  & 1.00\\
\foiii\ 4363  & 8.3  & 1.00  & 1.00  & 1.00  & 1.00  & 1.00\\
\foiii\ 5007+ & 451. & 1.00  & 1.00  & 1.00  & 1.00  & 1.00\\
\foiv\ 26$\mu$m & -- & (229) & (551) & (619) & (151) & (107)\\
\fneiii\ 3868 & 28.0 & 1.00  & 1.00  & 1.00  & 1.00  & 1.00\\
\fsii\ 4069$^{c}$ &3.7: & 0.31 & 0.22 & 0.24 & 0.25  & 0.21\\
\fsii\ 6716  & 1.7:  & 0.60  & 0.40  & 0.39  & 0.50  & 0.41\\
\fsii\ 6731  & 2.6:  & 0.63  & 0.41  & 0.40  & 0.49  & 0.41\\
\fsiii\ 6312  & 1.1: & 0.94  & 0.71  & 0.74  & 1.29  & 1.11\\
\fariii\ 7136  & 2.7 & 1.38  & 1.00  & 1.00  & 1.63  & 1.45\\
\fariv~4711$^{c}$ &5.4 & 0.76 & 0.95 & 1.02 & 0.41  & 0.29\\
\fariv\ 4740  & 2.7  & 0.93  & 1.00  & 1.00  & 0.47  & 0.34\\
\ffevi\ 5145  & $<$3. & 0.33 & 0.48  & 0.42  & 0.26  & 0.20\\
\noalign{\vskip3pt} \noalign{\hrule}\noalign{\vskip3pt} &&&&&&\\
\end{tabular} }
\par
\smallskip
{$^{a}$} D and S refer to 2- and 1-sector models respectively.
Models are labeled by \tbb\ in kK.
\par
{$^{b}$} ``$<$'' upper limit and ``:'' large uncertainty. Unobserved
lines: predicted intensities are given in parentheses in units of
\hb~=~100.
\par
{$^{c}$} Blends: \civ\ 4658 + \ffeiii\ 4658 + \ciii\ 4649
+ \oii\ 4651; \fsii~4069 + \ffev\ 4071 + \ciii\ 4069; \fariv\ 4711
+ \hei\ 4713 + \fneiv\ 4714~+~16.
\par
\end{table}