Fig. C.2.

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Observed normalised spectrum (solid black line) and the best fitting GSSP model (dotted red line) for the wavelength range 5120-5210 Å. It includes the strong Mg I triplet at 5167, 5172, and 5183 Å, which is used to determine the Mg abundance. To prevent label overlapping, an intensity threshold was applied for the line labelling.
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