Comparison of the observed spectrum (black) and synthetic spectra (colours) of the Hβ region and He I lines. For He I lines the different colours correspond to synthetic spectra calculated for various Teff, log g, and v sin i within the error limits (aquamarine: Teff = 26 000 K, log g = 3.7 dex, v sin i = 10 km s−1; blue: Teff = 28 000 K, log g = 3.9 dex, v sin i = 15 km s−1; red: Teff = 30 000 K, log g = 4.2 dex, v sin i = 20 km s−1).
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