Infrared (CAHA/O2000 and Spitzer/IRAC and MIPS) images centered on the ALMA detection coordinates. North is up and east to the left. We have included in all the J-band images (left panels) the position of the ALMA detections (green crosses), and the possible infrared counterparts to the APEX/LABOCA detections identified by BGH16 (green labels). The cyan diamonds represent the APEX/LABOCA peak intensity coordinates (ALMA phase center coordinates).We have also plotted the APEX/LABOCA beam of 13.8′′ radius (cyan dashed circle), the ALMA FOV of ~18′′ diameter (yellow dashed circle), and the ALMA beam at the bottom left corner (yellow solid ellipse).