a) Inclination angle as a function of the equivalent half-intensity width of the HeI 4471 line for gravitationally darkened stars rotating at the indicated Ωo/Ωc values, where the differential rotation parameter is set to α = 0.0.; b) Intersection of constant FWHM(HeI 4471)- and FWHM(MgII 4481)- curves of an early-type rapid rotator seen nearly pole-on.
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