Fig. C.1
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Spectral region around the lithium doublet (blue vertical lines) together with iron and calcium lines. The top panel shows stacked spectra of TOI-2046 (green) alongside with TOI-1135 (black) with similar spectral type and an age ~ 650 Myr (Mallorquín et al. 2024). The bottom panel shows stacked spectra of Qatar-4 (green) alongside with TOI-2048 (black) with similar spectral type and an age ~ 300 Myr (Newton et al. 2022). Both TOI-2046 and Qatar-4 show clear non-detection of the lithium hinting at an older age.
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