Table 9: Electron temperature in K. For BD+30 3639 a $N_{{\rm e}}= 11~000$ cm-3 has been used, and for NGC 6543  $N_{{\rm e}}=5000$ cm-3.
Ion IPLinesBD+30 3639   NGC 6543
 (eV)used (nm)Ratio $T_{{\rm e}}$  Ratio $T_{{\rm e}}$
N II14.5658.3/575.477.88400  69.49500
N II14.5654.8/575.4    28.88800
S III23.318 700/631.220.58600$^\dagger$  48.47800
O III35.1500.7/436.3    3877800
Ne III40.915 500/386.9    4.08000
Ar III27.68900/519.2    5317500$^\dagger$
$^\dagger$Large error.

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