Fig. 1
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Left : example Hα spectrum of the YSO candidate (Gaia Source ID: 3326702657541965952) from NGC 2264, with the source selected as a YSO due to its strong Hα line, i.e., with an EW(Hα) = −48.97 Å. Right : example 6708 Å Li spectrum of the YSO candidate ( Gaia Source ID: 3326714782234731520) from NGC 2264, with this source selected as a YSO due to its strong Li absorption line, i.e., with EW(Li) = 0.32 Å.
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