Fig. 1
Ionization equilibrium of nitrogen in PG 0122+200. Left: the N iv line at 4058 Å. Also seen is a broad and shallow absorption feature from the C iii triplet at 4068–4070 Å. Right: the N v doublet at 4604/4620 Å. Overplotted is a model with Teff = 80 000 K, log g = 7.5, C/He = 0.1, N/He = 0.01, and O/He = 0.01. Question marks denote unidentified lines.
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