Stellar continuum fit and subtraction over two wavelength ranges including the [OIII]λ5007 emission line (top panels) and the Hα+[NII] emission lines (bottom panels), performed for two galaxy stacks: ID = −2.0_8.5 (left) and ID=0.5_11.5 (right). In each plot, the upper panel shows the stacked spectrum (black) and the best fit to the stellar continuum (blue), while the lower panel shows the residual spectrum. The red-shaded regions mark the spectral windows that contain nebular features and are therefore masked from the stellar continuum fit.