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Table 4

Numbers of atomic levels and transitions that are accounted for in the model calculation.

Ion Levels Transitions Ion Levels Transitions
H I 22 231 Si IV 27 351
H II 1 0 Si V 11 55
He I 35 595 Si VI 1 0
He II 26 325 P IV 12 66
He III 1 0 P V 11 55
C II 32 496 P VI 1 0
C III 40 780 S III 1 0
C IV 25 300 S IV 11 55
C V 29 406 S V 10 45
C VI 1 0 S VI 22 231
N II 38 703 Fe III 1 0
N III 56 540 Fe IV 18 77
N IV 38 703 Fe V 22 107
N V 20 190 Fe VI 29 194
N VI 14 91 Fe VIII 19 87
N VII 2 1 Fe VIII 14 49
O II 37 666 Fe IV 15 56
O III 33 528 Fe X 28 170
O IV 29 406 Fe XI 26 161
O V 36 630 Fe XII 13 37
O VI 16 120 Fe XIII 15 50
O VII 1 0 Fe XIV 14 49
Si III 24 276 Fe XV 1 0

Notes. The numbers for iron refer to superlevels and superlines; Fe stands for a generic element that includes the whole iron group.

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