**Table 8:** Parameters representing the best-fit model.
Parameter	Value
Ionizing source
Model atmosphere	Tlusty
$T_{\rm eff}$	47 500 K
Log g	3.75
Luminosity	1640 $L_{\odot}$
Nebula
Density profile	See Fig. 2
Abundance	H He C N
	12.000
	O Ne Si P
	8.586
	S Cl Ar Fe
	6.377
Size	$20\hbox{$^{\prime\prime}$ }$ (radius)
Distance	1.40 kpc
Dust grains	Silicates of single size $0.01~\mu$ m; see Fig. 5
Inner radius	6.283e15 cm ( $\sim$ 0.00203 pc)
Outer radius	4.189e17 cm ( $\sim$ 0.136 pc)
Filling factor	1.0

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