Rest-frame SEDs of the PAH galaxies normalised at 7.7 μm (MIR-normalised; top) and 3.5 μm (NIR-normalised; bottom) with one-sigma error bars. The normalisation wavelengths are indicated by solid vertical lines in all panels. The left and right panels show the same SEDs but for the entire OPT–NIR–MIR and only the NIR–MIR wavelengths, respectively. The SEDs are shown in different colours for different redshift bins: blue, black, and red for the nearby, mid-z, and higher-z galaxies, respectively.