Fig. 3

Difference between the measured and predicted K-parameters for three different field strengths at various rotation rates. The actual measurement, when deriving the relation of Eq. (2) is also shown. The black circles are for HD 137909 with ⟨ B ⟩= 5.2 kG, the blue triangles are for HD 144897 with ⟨ B ⟩= 9.6 kG and the red square are for HD 126515 with ⟨ B ⟩= 15 kG.
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