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Table 2

Number of NLTE levels and lines in our model ions.

He 19.35 16.120
C 51.217 54.295
N 34.129 90.546 54.297
O 72.322 83.637 50.235a
F 30.70 30.104 30.93b
Ne 46.126 40.126 94.641c
Si 17.28 30.102 25.59
P 36.28 18.49
S 57.332 39.107 25.48
As 14.7 5.10 14.5 7.1
Sn 21.9 10.16 9.5 15.5

Notes. First and second number of each table entry, separated by commas, denote the number of levels and lines, respectively. Not listed for each element is the highest considered ionization stage, which comprises its ground state only. See text for the treatment of iron-group and trans-iron elements besides As and Sn. (a) For WD 0111+002, O V was the highest ionization stage with one level. (b) Only considered for PG 1707+427. (c) For WD 0111+002, Ne V was the highest ionization stage with one level.

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