SCUBA-2 S/N maps at 850 μm (left column) and 450 μm (right column) for three example fields: one ELAN (Fabulous), the most overdense quasar field (SDSSJ 0819+0823), and one of the least overdense quasar fields (J020944+051713). The size of each panel is about 15′×15′. The red star in each panel indicates the location of the ELAN and quasars. The 850 and 450 μm detections with corresponding ID numbers are highlighted as black circles and magenta diamonds, respectively. For each map, we indicate the noise contours (black dashed) for levels of 1.5, 2, and 3 times the central noise, the last of which defines the outer boundary for source extraction (Table 1). The 850 and 450 μm maps for all other fields are shown in Appendix C.