Stacked mean spectrum of simulated MAMBO galaxies from the EWS with stellar masses in the range 10¹⁰ M_⊙ ≤ M_* ≤ 10^10.5 M_⊙ and redshifts 1.52 ≤ z ≤ 1.86. The stacked is composed of a mixture of 2642 spectra, with contributions from galaxies with accurate redshifts (51%), as well as redshift contaminants arising from noise spikes (36%), [S III]λ9531 misclassified as Hα (8%), and [O III] misclassified as Hα (2%), plus minor contributions from other misclassified emission lines (∼5% in total). The plot includes the mean spectrum (red) and composite spectra at the 16th, 84th, 90th, 98th, and 99th percentiles (brown, orange, yellow, blue, and green, respectively). The contribution of individual galaxy spectra is shown in black.