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Fig. 6

image

Reduced equivalent width W′ ⟩ from CaII triplet from Rutledge et al. (1997) against [Fe/H] from this work. The blue solid line is the quadratic function fitted to the data (Eq. (4)) and the red dashed line is the cubic function fitted by C09 to calibrate W′ ⟩ R97 to their scale. Fitted curves are shown only in their respective valid ranges.

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