Physical conditions for abundance determinations.
|Te([N ii]), ne(low to medium)a||N+, O+, S+, Cl+, Fe+ and Fe++|
|Te([O iii]), ne(low to medium)a||O++, S++, Cl++, Ar++ and Fe3 +|
|Te([Ar iv])b, ne(high)a||Cl+3, Ar+3, Ar+4, Ne++, Ne+3 and Ne+4|
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