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Fig. A.1.

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ESPRESSO spectra of DM Tau around the Li 6708 Å feature. Positions of the Li isotope resonance D lines are indicated by the magenta lines. Potential blends from elements with a lower abundance are marked by the black lines. From left to right, these are Fe I, V I, Cr I, Si I, V I, FeI, and Fe I (Franciosini et al. 2022a).

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