Fig. 4
Relation between stellar effective temperature and pEW for the chromospheric Hα (left) and Ca II IRT lines (right). Cyan crosses represent the valid sample as defined for the He I IR line measurements. Red circles represent stars with Hα in absorption. Black circles represent stars with both the Hα and the He I D3 line in emission, and orange circles symbolise stars with spectra showing only Hα in emission.
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