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Fig. 4


He I / He II, C III / C IV, and O IV / O V ionization equilibria in our Teff = 70   kK model compared with FUSE, GHRS (smoothed with a low-pass filter (m = 15, n = 4) for clarity, Savitzky & Golay 1964), and UVES observations. Wavelength and flux scales are indicated by bars. The model spectrum is convolved with a Gaussian to match the respective instrument’s resolution. Unidentified lines in the model stem from Ca-Ni.

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