Fig. 2.
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Mean ⟨R′HK⟩ index distribution of all sample stars. The grey areas represent the ±1σ envelopes of the histograms of 1000 realisations of the distribution of R′HK indices of the sample stars assuming a Gaussian distribution around the mean measurement values with the uncertainties provided in the AMBER-HARPS catalogue of 
indices (Gomes da Silva et al. 2021).
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