Illustration of where [S III] 9530.9 Å, Hα, and [O III] 5006.84 Å lie within the Spitzer/IRAC 3.6 μm and 4.5 μm bands at the low and high-redshift ends (left and right panels, respectively) of the redshift intervals selected for this analysis. The transmission curves of the 3.6 μm and 4.5 μm bands are shown as the blue and red lines, respectively. The orange color-shaded regions denote the wavelengths over which relevant lines (Hα and [S III] 9068.6 Å) lie within our defined redshift windows. z₁ does not extend beyond z = 2.9 because MUSE sources at z <  2.9 are identified from spectral features other than Lyman α.