Table 10: Ionic concentrations and chemical abundances.
Ion $\lambda$ BD+30 3639 NGC 6543
  (nm) $N_{\rm {ion}}$/ $N_{\rm {p}}$ $\sum N_{\rm {ion}}$/$N_{\rm {p}}$ ICF$^\natural$ $N_{\rm {elem.}}$/ $N_{\rm {p}}$ $N_{\rm {ion}}$/ $N_{\rm {p}}$ $\sum N_{\rm {ion}}$/$N_{\rm {p}}$ ICF$^\natural$ $N_{\rm {elem.}}$/ $N_{\rm {p}}$
He0 447.2, 587.5 0.061$^\star$       0.118$^\star$      
He+ 468.6         4.0(-5)$^\star$ 0.118 1 0.118
C+ 232.5 6.49(-4)       2.34(-5)      
C++ 190.9 8.42(-5) 7.33(-4) 1 7.3(-4) 1.89(-4) 2.12(-4) 1.2 2.5(-4)
No 519.7, 520.0 2.16(-6)              
N+ 575.5, 658.4 1.07(-4)       8.70(-6)      
N++ 57 300,174.5 <1.70(-5)       2.13(-4)      
N3+ 148.5   1.09(-4) 1 1.1(-4) 1.13(-5) 2.33(-4) 1 2.3(-4)
Oo 630.0, 636.3 5.32(-6)              
O+ 372.7 4.47(-4)       1.99(-5)      
O++ 495.9, 500.7 4.13(-6)       5.26(-4)      
O3+ 25890   4.56(-4) 1 4.6(-4) <6.03(-8) 5.46(-4) 1 5.5(-4)
Ne+ 12 800 1.73(-4)       1.21(-5)      
Ne++ 15 500, 36 010 <6.80(-7)       1.66(-4)      
Ne3+ 241.9   1.73(-4) 1.13 1.90(-4) 1.31(-5) 1.91(-4) 1 1.9(-4)
S+ 671.6, 673.0 1.32(-6)       1.94(-7)      
S++ 18 700, 33 400 5.07(-6)       7.24(-6)      
S3+ 10 500 <2.60(-8) 6.39(-6) 1 6.4(-6) 5.37(-6) 1.28(-5) 1 1.3(-5)
Cl+ 857.8, 912.6 4.11(-8)       4.58(-9)      
Cl++ 551.9, 553.9 9.55(-8)       1.48(-7)      
Cl3+ 11 760, 753.0 <5.10(-8) 1.37(-7) 1 1.4(-7) 5.03(-8) 2.03(-7) 1 2.0(-7)
Ar+ 6980 4.69(-6)       1.33(-7)      
Ar++ 8990 2.76(-7)       3.34(-6)      
Ar3+ 471.1, 474.0   4.97(-6) 1.04 5.2(-6) 7.02(-7) 4.19(-6) 1 4.2(-6)
$^\natural$ ICF: Ionization Correction Factor.
$^\star$ Using the predictions for the helium emission lines given by Benjamin et al. (1999).

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