Comparison between synthetic spectra and the He ii 4686 Å line from HIRES (1997-08-12). Left panel: synthetic spectra from models at 82 000 K, log g = 6.4, and log N(He)/N(H) = −1.0. The red spectrum comes from a model with the abundances of BD+28°4211 determined in Paper I. The blue spectrum is from a model with ten times solar metallicity. Right panel: spectra from the ten times solar metallicity grid with various surface gravities.