Table 6: Ionic and total abundances (in the scale ${\rm 12+\log~(X/H)}$).
$\lambda_0$ Abund. NGC 2579 ESO 379-9 Orion
4471 He+/H+ 10.93 $\pm$ 0.01 10.83 $\pm$ 0.06  
5876 He+/H+ 11.02 $\pm$ 0.02 10.77 $\pm$ 0.03  
6678 He+/H+ 10.94 $\pm$ 0.01 10.83 $\pm$ 0.02  
avg. He+/H+ 10.96 $\pm$ 0.04 10.81 $\pm$ 0.02  
  He/H 10.96 $\pm$ 0.04 11.14 $\pm$ 0.18 10.99
3727 O+/H+ 7.65 $\pm$ 0.16    
4959 O++/H+ 8.32 $\pm$ 0.06 7.75 $\pm$ 0.11  
5007 O++/H+ 8.30 $\pm$ 0.05 7.73 $\pm$ 0.11  
avg. O++/H+ 8.31 $\pm$ 0.06 7.73 $\pm$ 0.11  
  O/H 8.39 $\pm$ 0.05 8.33 $\pm$ 0.20 8.47
5518 Cl++/H+ 5.02 $\pm$ 0.05    
5538 Cl++/H+ 5.04 $\pm$ 0.05    
avg. Cl++/H+ 5.03 $\pm$ 0.05    
  Cl/H 5.16 $\pm$ 0.08   5.16
3869 Ne++/H+ 7.60 $\pm$ 0.08    
3968 Ne++/H+ 7.54 $\pm$ 0.11    
avg. Ne++/H+ 7.59 $\pm$ 0.08    
  Ne/H 7.68 $\pm$ 0.06   7.71
6548 N+/H+ 6.61 $\pm$ 0.12 7.24 $\pm$ 0.10  
6584 N+/H+ 6.63 $\pm$ 0.12 7.21 $\pm$ 0.08  
avg. N+/H+ 6.63 $\pm$ 0.12 7.22 $\pm$ 0.09  
  N/H 7.37 $\pm$ 0.06 7.35 $\pm$ 0.12 7.62
4069 S+/H+ 5.18 $\pm$ 0.12    
6716 S+/H+ 5.31 $\pm$ 0.13 5.93 $\pm$ 0.08  
6731 S+/H+ 5.31 $\pm$ 0.12 5.93 $\pm$ 0.08  
avg. S+/H+ 5.30 $\pm$ 0.12 5.93 $\pm$ 0.08  
6312 S++/H+ 6.78 $\pm$ 0.08    
  S/H 6.91 $\pm$ 0.11 6.75 $\pm$ 0.19 6.97
7136 Ar++/H+   6.05 $\pm$ 0.08  
  Ar/H   6.43 $\pm$ 0.19 6.52

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