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Fig. 6

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The HR diagram with the data of the present work and the results from Reiners et al. (2003–2006). Differential rotators are indicated by filled circles while rigid rotators are shown by open circles. Evolutionary models and the granulation boundary are indicated as in Fig. 5. The shade highlights the region where no differential rotators are detected. Triangles denote HD 30739, HD 43940, HD 129422 which are considered rigid rotators with gravitational darkening (Sect. 6). The fast differential rotators at the granulation boundary are HD 6869, HD 44892, HD 60555, HD 109238, and Cl*IC 4665 V 102 which display strongest horizontal shear (Reiners & Royer 2004; Reiners 2006). Stars possibly affected by multiplicity (flags “m”, “x”, and “y” in Tables 1 and 2) are not included.

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