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Fig. 9


υmacro as a function of the highest ratio of turbulent-to-total pressure for the 13 B-type SMC stars (black and blue squares) in Dufton et al. (2006) compared to the set of Galactic OB stars (colored circles) in Fig. 5 of Grassitelli et al.(2015a; for a description of the different colors, see Grassitelli et al. 2015a; and Simón-Díaz 2015). Blue circles indicate the sub-sample of 9 stars used also in Fig. 10. The dashed line indicates the linear best fit adopted to predict the theoretical macroturbulent velocities from Fig. 5 by Grassitelli et al. (2015a), while the dotted lines indicate standard error bars of ≈ 20% of υmacro.

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