Comparison between the spectrum of OGLE-GD-CEP-0516 obtained (black line) and the synthetic spectrum (red line) in three main spectral intervals centred, respectively, on Hβ (top-left panel), Hα (top-right panel), and the Li I line at 6707.766 Å (bottom panel). The spectral features not reproduced with the synthetic spectrum in the wing of Hα are telluric lines. The lithium line has been reproduced with A(Li) = 3.06 ± 0.10 dex.