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Fig. 5


a) FWHM in km s-1 observed at different angles i of the HeI 4471 line broadened by differential rotation characterized by different values of the parameter α in an object of “pnrc” parameters Teff = 23 000 K and log g = 4.1 rotating at different rates η. In abscissas are the FWHM of the same line corresponding to rigid rotators having the same rates η. b) Idem for the MgII 4481 line.

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