IR combined SED built from the ALMA-detected objects from the ALPINE sample, from Burgarella et al. (2020), and with the two stacks from Bethermin et al. (2020) and the associated uncertainty regions. We note that the four left-most points for the stacks are upper limits, as shown by the error bars reaching the bottom of the figure. The SEDs corresponding to optically thin modified black bodies are superimposed to the observed SEDs. Qualitatively, we can see that the IR-combined SED seems to be in agreement with greenish modified blackbody SEDs, that is T_dust ∼ 50–60 K. A qualitative analysis is performed later in this paper.