Best-fit panchromatic (UV-radio) rest-frame SEDs of 16 of our target SMGs. The source ID and redshift are shown on the top of each panel. The red points with vertical error bars represent the observed photometric data, and those with downwards pointing arrows indicate the 3σ upper flux density limits (taken into account in the fits). The blue line is the best-fit MAGPHYS model SED from the high-z library (da Cunha et al. 2015). All the SMGs, except AzTEC 21b, are detected in at least one radio frequency (see Fig. 2 for the pure radio SEDs).