Fraction of Hα active stars as a function of spectral type for the Carmencita sample (upper left), CARMENES GTO sample (upper right), 14 pc sample (lower left) and 7 pc sample (lower right). The numbers shown on the plot are the total number of stars in the respective spectral type bin. Error bars show 1σ uncertainties. The lower two panels have a smaller range in spectral type.
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