Fig. 4.

Line profile centered on 3131+Å for a mixed model realized with the sum of the spectra from the model with Teff = 15 000 K and vmax = 2500 km s−1 (solar metallicity) and the model with Teff = 15 000 K and vmax = 2500 km s−1 (also solar metallicity), the latter being shifted 1100 km s−1 blueward. The two spectra have been added with a 80:20% ratio.
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