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Fig. 2
Characteristic PG 1159 star absorption-trough region of PG 0122+200. In addition to the usual C iv 4645–4665 Å lines and He ii λ4686, a broad O iv line at 4632 Å is seen and possibly a N iv line at 4707 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.
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