Stacked SED computed from the 12 ALMA 1.1 mm sources analyzed in this study. The black dots and limits show the photometry of all the sources after de-redshifting the SEDs and normalizing them by their 1.1 mm flux density. The red points present the stacked photometry, where error bars on the flux densities are derived from the standard deviation in each bin. The blue curve denotes the SED template from Kirkpatrick et al. (2015), combining star formation and AGN contributions.