Example of our continuum fit and subtraction performed for the stacked spectrum with log(SFR/ M⊙ yr−1) = 1.4 and log(M⋆/M⊙) = 10.9 in the Mg I and Na I D regions (left and right panel, respectively). The observed stacked spectrum is shown with a solid black line, the best-fit stellar continuum model in red and stellar emission lines in cyan. The dotted lines indicate the stellar Mg I triplet at λλ5167, 5173, 5184 Å and the [NI]λ5198, 5200 Å emission lines (left panel), and the He I λ5876 emission and the Na I doublet λλ5890, 5896 (right panel). The bottom panels show the residual spectra (solid black line) and the residual variations (dashed lines). The Mg I region is reproduced well by the stellar fit with residuals lower than the mean scatter. The Na I D fit is instead affected by significant residuals, revealing a blue-shifted extra absorption component.
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