Profiles of the two Fe i lines of three F stars (black lines and diamonds) in comparison to disc-integrated profiles from the F3V simulation (red curves). For the rotational broadening of the synthesised lines, an inclination of the rotation axis of i = 60°. For a better comparison, the line profiles were multiplied by a factor such that the depth of the line core come into agreement. For the projected rotational velocities υrotsini and differential rotation parameter α the values by Ammler-von Eiff & Reiners (2012) were used; for comparison, the blue curve in the right panels shows a disc-integrated profile with the same υrotsini but α = 0.
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