GIST-fitted spectra for one of the bins. The top and bottom panels show stellar and gas emission line fitting. Top panel: Black, red, and green lines represent the observed spectrum, fitted stellar continuum, and observed stellar continuum. The grey-shaded regions show the emission lines, which were masked during the fitting of the stellar continuum. Bottom panel: Black, red, orange, and green lines represent the observed spectrum, fitted gas emission spectrum, fitted stellar continuum, and observed-(stellar+gas) emission (residual) spectrum.