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Fig. 7.

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Estimated lithium abundances versus observed abundances from M21 using grid B (left) and grid C (right). The diamonds and downward triangles refer to the 16 Cyg A and B stars (KIC 12069424 and KIC 12069449), respectively, and the star represents the Sun. The arrows pointing to the left indicate upper limits. The dashed line marks where the observed value is equal to the estimated value.

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