Fig. 8
Top panels: optical spectra of HD 54879 taken on Jan. 15, 2011 (black), and the O9.7 V standard HD 36512 (grey). Bottom panels: difference between the two stars, after convolving HD 54879 to match the broadening of HD 36512. The lines showing the most substantial differences are highlighted. The mismatch at 4428 Å is the result of a diffuse interstellar band.
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