Example of the subtraction technique applied to an active and lithium-rich star both in the lithium (upper panel) and Hα spectral regions (lower panel). In both panels, the continuum of the residual spectrum (blue line) is set to 1, while the original spectrum (full black line) and the non-active template (thin red line) are shifted downward by 0.3 in continuum units. The green lines indicate the residual absorption (for Li I) or emission (for Hα) profile that has been integrated to obtain the equivalent width.
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