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Table 2

Number of levels and super-levels for each atomic species included in models.

Ion Full levels Super-levels Ion Full levels Super-levels
H I 30 30 P V 62 16
He I 69 69 S III 78 39
He II 30 30 S IV 108 40
C II 322 92 S V 144 37
C III 243 99 S VI 58 28
C IV 64 64 Ar III 346 32
N II 442 358 Ar IV 382 50
N III 287 57 Ar V 376 64
N IV 70 44 Ar VI 81 21
N V 49 41 Ca III 232 44
O II 274 155 Ca IV 378 43
O III 104 36 Ca V 613 73
O IV 64 30 Ca VI 288 48
O V 56 32 Fe II 100 100
O VI 31 25 Fe III 607 65
Ne II 48 14 Fe IV 1000 100
Ne III 80 32 Fe V 1000 139
Ne IV 112 39 Fe VI 1000 59
Ne V 166 37 Fe VII 41 252
Mg II 44 36 Ni III 150 24
Si II 56 56 Ni IV 200 36
Si III 50 50 Ni V 183 46
Si IV 66 66 Ni VI 182 40
P IV 178 36 Ni VII 37 308

Notes. The ions listed here are used (or not) according to the effective temperature of the models.

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