Table 2: Comparison between CLOUDY abundance determinations with either blackbody central star and a constant density, with model atmosphere by Rauch (2003), and with BB and a density falling off as r-2 (two PNe). The last raw gives the ICF abundance determinations (M 03).
Id Method He/H  N/H  O/H S/H Ar/H
91 CL$_{\rm BB}$ 11.31 7.86 8.61 6.42 6.26
  CL $_{\rm rauch}$ 11.20 8.01 8.64 6.52 6.25
  CL $_{{\rm BB+d}\propto r^{-2}}$ 11.31 8.07 8.48 6.60 6.18
  ICF $_{\rm {M~03}}$ 11.28 7.83 8.70 6.61$\dag $ 6.32
93 CL$_{\rm BB}$ 11.00 7.53 8.69 6.46 6.17
  CL $_{\rm rauch}$ 10.92 7.55 8.60 6.44 6.13
  CL $_{{\rm BB+d}\propto r^{-2}}$ 10.93 7.75 8.47 6.66 6.09
  ICF $_{\rm {M~03}}$ 11.00 7.50 8.85 6.44$\dag $ 6.36
101 CL$_{\rm BB}$ 11.07 7.33 8.76 6.18 6.27
  CL $_{\rm rauch}$ 11.14 7.34 8.70 6.13 6.22
  ICF $_{\rm {M~03}}$ 11.15 7.21 8.72 6.32$\dag $ 6.45

$\dag $ See text.

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