Table 3: Parameters of the best fit model.
Parameter Value

Distance 3.1 kpc (see Sect. 3)

CSPN:

    Luminosity L = 325 $\pm$ $100~L_\odot$

    Effective temperature $T_{\rm eff} = 121.5$ $\pm$ $6~{\rm kK}$

    Age from post-AGB t = 8300⁺¹⁵⁰⁰_-500 years

    White dwarf mass M = 0.605 $\pm$ $0.02~M_\odot$

PN gas shell:

    Average radius angular 22 $^{\prime\prime}$

     linear r = 1.02 $\times$ $10^{16}~{\rm m}$

    Thickness $\Delta_r/r = 0.2$

    Filling factor $\epsilon = 0.05$ (adopted)

    Electron density $n_{\rm e} = 200$ $\pm$ $100~{\rm e}^-~{\rm cm}^{-3}$

    Abundances:

      Helium [He] = -0.83

      Nitrogen [N] = -4.00

      Oxygen [O] = -3.40

**Table 3:** Parameters of the best fit model.
Parameter	Value
Distance	3.1 kpc (see Sect. 3)
CSPN:
Luminosity	L = 325 $\pm$ $100~L_\odot$
Effective temperature	$T_{\rm eff} = 121.5$ $\pm$ $6~{\rm kK}$
Age from post-AGB	t = 8300⁺¹⁵⁰⁰_-500 years
White dwarf mass	M = 0.605 $\pm$ $0.02~M_\odot$
PN gas shell:
Average radius	angular 22 $^{\prime\prime}$
	linear r = 1.02 $\times$ $10^{16}~{\rm m}$
Thickness	$\Delta_r/r = 0.2$
Filling factor	$\epsilon = 0.05$ (adopted)
Electron density	$n_{\rm e} = 200$ $\pm$ $100~{\rm e}^-~{\rm cm}^{-3}$
Abundances:
Helium	[He] = -0.83
Nitrogen	[N] = -4.00
Oxygen	[O] = -3.40

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