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Fig. 14

image

Distribution of the helium abundance (top), microturbulence (middle) and wind-strength Q-parameter (bottom) in the sHR diagram. Stars for which it was only possible to obtain upper or lower limits for any of these quantities are indicated by symbols with the border in black. The range in the legend corresponds to the central value in case of a well-determined value, or to the upper or lower limit otherwise.

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