Comparison of the various fits of the IR composite SED built with data from Burgarella et al. (2020), from ALPINE, and from the z ∼ 4.5 and z ∼ 5.5 stacks from Bethermin et al. (2020). Top: fit with a modified general blackbody and power law in the mid-IR as in Casey (2012). Middle: fit with an optically thin modified blackbody and power law in the mid-IR as in Casey (2012). Bottom: Fit with a model from Draine et al. (2014). The fits are all statistically equivalently good with reduced χ² ≈ 0.3–0.4.