Composite spectra from ultraviolet to optical rest frame wavelengths. The black line represents the stack obtained from the entire sample, shown as a reference. The red lines in the different panels represent the final stack in each bin from the combined composites from blueward of Lyα to Hα. The combined spectra covers the rest-frame wavelength interval 800–7000 Å. The spectral flattening at wavelengths longer than 4000 Å is likely due to the contribution of the host galaxy emission.