Stack of all star-forming galaxies selected for our analysis (AGNs excluded). The green diamonds represent the pseudocontinuum points used for fitting the cubic spline to the stellar continuum. The red continuous line highlights the combined fit to the Si IIλ1260, Si IIλ1526, C IIλ1334, and Al IIλ1670 absorption lines, while the grey shaded regions have been masked in the fit. The vertical lines highlight the features used in the combined fit (in red), the absorption lines excluded from the combined fit but measured separately (in pink), and the emission lines used for the systemic redshift estimation (in green).