Table 3: Derived nebular properties. $L_{\rm cs}$ is the luminosity of the central star. Note that H$\beta $ fluxes are derived from the H$\alpha $ fluxes assuming standard case B recombination.
  N5236-254 N5236-487 N3621-1106
L (H$\alpha $) [1035 erg s-1] 5.14 $\pm$ 0.85 4.44 $\pm$ 0.73 -
L (H$\beta $) [1035 erg s-1]$^\star$ 1.80 $\pm$ 0.30 1.56 $\pm$ 0.25 -
L ([O III]) 6.11$\pm$0.99 5.10 $\pm$ 0.84 18.7 $\pm$ 4.49
M5007 $-3.01\pm0.18$ $-2.82\pm0.18$ $-4.23\pm0.26$
Excitation parameter (E) 1.52 $\pm$ 0.14 1.47 $\pm$ 0.14 -
$\log T_{\rm eff}$ [K] 4.66 $\pm$ 0.02 4.65 $\pm$ 0.02 -
$\log L_{\rm cs}$ [$L_{\odot}$] 3.79 $\pm$ 0.08 3.73 $\pm$ 0.08 -

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