Fig. 6

Panels a–c: Parameters Vsini determined with the FT method using the He i 4471 line produced in atmospheres having a rotation law given by Eq. (4)with Υ = coskθ and characterized by different values of k and α, against the actual Veqsini in stars having M = 9 M⊙ and t/tMS = 0.6, and rotating with several equatorial ratios η. Panels d–f: Same for the Mg ii 4481 line.
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