Combined AS2UDS and AS2COSMOS SMG sample in the PRIMER survey ranked in descending ALMA 870 μm flux. For each SMG, we show the 3$\stackrel{″}{.}$0  ×  3$\stackrel{″}{.}$0 false colour image (F444W/F356W/F277W as R/G/B), labelled with the SMG ID, redshift (MAGPHYS derived, z_p, or spectroscopic, z_s) and ALMA 870 μm flux density. We further label the SMGs visually classified as major mergers (M) minor mergers or interactions (I), regular discs (D), or compact (C) as well as those potentially affected by gravitational lensing (Lens). The red cross indicates the ALMA 870 μm position.