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Fig. E.1

image

Best-fit CMFGEN model (red) compared to the observed spectrum (blue) of BD +34°1058 (O8nn; vsin i = 424 km s-1). Diagnostic lines are indicated. The He i 5876 line appears too strong compared to the best-fit model, while the fit of He ii 4686 and He ii 5412 is imperfect, probably because of normalisation problems.

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