Comparison between the stacked SLEDs of Boogaard et al. (2020) and the results from SIDES. The filled blue and red circles represent the SLED of z ∼ 1.2 objects detected in CO(2–1). The red filled squares correspond to the z ∼ 2.5 objects detected in CO(3–2). The SLED is normalized to unity for the transition used to select the sample to stack. The light and dark shaded areas show, respectively, the 1 and 2σ confidence region of the mean SLED in our simulation, taking into account the sample variance (see Sect. 3.3).