Layout of the structures found in a 50′ × 50′ region in the Cosmos field overlaid on a density map of red SPIRE sources. Planckred-excess contours (at 30, 40, 50, 68, 95 and 99.7% of the highest value) are shown as purple lines. Different symbols are members of the following structures: COS1000+0215 protocluster at z = 2.45 (blue stars; Diener et al. 2015; Chiang et al. 2015), CL J1001 at z = 2.51 (magenta up-side down triangles; Wang et al. 2016, 2018), PCL 1002 at z = 2.47 (green triangles; Casey et al. 2015), CC2.2 at z = 2.23 (turquoise blue diamonds; Darvish et al. 2020), and ZFIRE at z = 2.09 (light blue circles; Yuan et al. 2014; Hung et al. 2016). The spectroscopic members in G237 are shown as open circles (red: 2.15 ≤ z < 2.164, yellow: 2.164 < z < 2.19, and orange: 2.19 < z < 2.20), and the HAEs (Koyama et al. 2021) as red diamonds. The dashed white circle represents the 1.4′ radius circle masked in the L16 Cosmos catalog due to a bright star. Large black dashed circles (2.5′ radius) indicate locations, close to the selected protoclusters, where a signal ≳2σ is detected in the Planck RX map, but not significant enough to be selected as a PHz source.