Table 8: Electron density in cm-3. For BD+30 3639 a $T_{{\rm e}}=8500$ K has been used, and for NGC 6543  $T_{{\rm e}}=8200$ K.
Ion IPLinesBD+30 3639   NGC 6543
 (eV)used (nm)Ratio $N_{{\rm e}}$  Ratio $N_{{\rm e}}$
S III34.818 700/33 5005.010 200  2.63400
O II35.1372.6/372.92.511 300  2.49300$^\dagger$
Cl III39.6553.8/551.83.148 000  1.46600
$^\dagger$Uncertain density.

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