Upper panel: median model dust-SED for the 753 galaxies (black solid line). The median model dust-SED separately for the ETGs, LTGs, and Irs is also shown with the dashed red, dashed blue, and dashed light-blue lines. All model dust-SEDs are normalised to the 3.4 μm luminosity. Lower panel: exact same as in the upper panel, but zooming into the mid-IR part of the spectrum, from 2.5 μm to 22.5 μm.