Four illustrative examples of stars in which a good fit could not be achieved. Solid blue lines correspond to the synthetic spectra of the best fitting FASTWIND model resulting from the IACOB-GBAT analysis. For HD 24431 and HD 188209 (stars labeled with the Q3 quality flag) we also include the synthetic spectra of two models with different values of the Q parameter (see text for details) where green (red) corresponds to higher (lower) Q, respectively. For HD 188209 green and blue lines are overlapped.
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