a) Normalised Hα luminosity taken from Reiners et al. (2012) as a function of Δ[Fe/H]; b) normalised Hα luminosity taken from Reiners et al. (2012) as a function of ΔTeff; c) Hα index defined by Gomes da Silva et al. (2011) versus Δ[Fe/H]; d) Hα index defined by Gomes da Silva et al. (2011) versus ΔTeff. The stars in common were taken from our full sample. The red dashed lines mark the limits above which the stars were excluded from the final sample.
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