Fig. 3
Results from RA17 for helium abundance (YHe) vs. microturbulent velocity for our sample stars (same symbols and colours as in Fig. 2). Horizontal dashed and solid lines indicate, respectively, the expected value of YHe for unevolved massive stars in the LMC (~0.09, e.g. Brott et al. 2011) and the mean value of 0.1 ± 0.02 derived from the current analysis (see Sects. 3.3 and 4.2 for details).
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