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Table A.1:

Model parameters and results.
Modela D105 D135 D160 S180 S310
L ($L_{\odot}$) 2423 2550 2420 2080 2084
$R_{{\rm in}}$ (1017 cm) 1.00 1.00 1.00 2.58 1.82
$R_{{\rm out}}$(thin) (1017 cm) 2.08 2.15 2.14 2.97 2.06
$R_{{\rm out}}$(thick) (1017 cm) 2.91 2.98 2.80 - -
$f^{{\rm cov}}$(thick) 0.027 0.013 0.012 - -
$N_{{\rm in}}$(H) (cm-3) 1200 1200 1200 1000 1600
$\langle$$n_{\rm e}$$\rangle$ (cm-3) 1942 1860 1870 1590 2940
$\langle$T(H+)$\rangle$ (104 K) 1.752 1.780 1.781 1.730 1.669
$\tau_{\rm c}$ 1.00 1.75 1.65 0.90 0.90
$\tau$(thin) (13.6 eV) 0.50 0.79 1.09 1.37 3.40
H$\beta$(thin) fraction 0.73 0.87 0.89 1.00 1.00
$M_{{\rm ion}}$ (10-2 $M_{\odot}$) 6.83 7.02 6.85 6.11 3.37
He/H 0.122 0.108 0.105 0.120 0.110
C/H ($\times$10-5) 13.0 22.0 26.5 11.7 25.0
N/H ($\times$10-5) 1.30 2.56 3.10 1.42 1.24
O/H ($\times$10-5) 8.35 17.5 22.0 7.72 8.26
Ne/H ($\times$10-5) 1.22 2.57 3.49 1.29 1.50
S/H ($\times$10-7) 14.9 17.3 19.7 12.7 11.4
Ar/H ($\times$10-7) 3.40 3.96 4.55 2.90 2.60
Fe/H ($\times$10-7) 4.00 4.00 4.00 4.00 4.00
Lines $I_{{\rm obs}}$b Predicted intensity / Observed intensity
H$\alpha $ 6563 284. 0.99 0.99 1.00 1.04 1.06
H$\gamma$ 4340 50.4 0.94 0.94 0.94 0.94 0.94
H$\delta$ 4101 27.7 0.96 0.97 0.97 1.00 1.01
He  I 5876 2.8 2.56 1.00 0.75 1.13 0.74
He  II 4686 98.1 0.88 1.00 1.00 0.98 0.91
III] 1908 - (591) (573) (582) (625) (1267)
IV 1549 - (1239) (1864) (1978) (667) (835)
IV 4658c 3.0: 0.12 0.18 0.22 0.12 0.09
6584 9.4 1.00 1.00 1.00 1.00 1.00
6300 <2. 0.64 0.74 0.77 0.03 0.03
3727 26.8 1.00 1.00 1.00 1.00 1.00
4363 8.3 1.00 1.00 1.00 1.00 1.00
5007+ 451. 1.00 1.00 1.00 1.00 1.00
26$\mu$m - (229) (551) (619) (151) (107)
3868 28.0 1.00 1.00 1.00 1.00 1.00
4069c 3.7: 0.31 0.22 0.24 0.25 0.21
6716 1.7: 0.60 0.40 0.39 0.50 0.41
6731 2.6: 0.63 0.41 0.40 0.49 0.41
6312 1.1: 0.94 0.71 0.74 1.29 1.11
7136 2.7 1.38 1.00 1.00 1.63 1.45
 4711c 5.4 0.76 0.95 1.02 0.41 0.29
4740 2.7 0.93 1.00 1.00 0.47 0.34
5145 <3. 0.33 0.48 0.42 0.26 0.20
a D and S refer to 2- and 1-sector models respectively. Models are labeled by $T_{{\rm BB}}$ in kK.

b ``<'' upper limit and ``:'' large uncertainty. Unobserved lines: predicted intensities are given in parentheses in units of H$\beta$ = 100.

c Blends: C  IV 4658 + [Fe  III] 4658 + C  III 4649 + O  II 4651; [S  II] 4069 + [Fe  V] 4071 + C  III 4069; [Ar  IV] 4711 + He  I 4713 + [Ne  IV] 4714 + 16.


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