Model colour tracks displayed in the proposed colour−colour space with JWST bands adapted from KIM criterion. Each panel presents a specific group: a) early/late, b) starburst, c) hybrid, and d) AGN. The dotted portion of the tracks refers to the redshift range where [2.0] − [4.4]  ≤ 0, and [2.0] − [4.4]  > 0 when solid. Red circles and stars along the lines mark z = 1 and z = 2.5, respectively. The light and dark-grey regions show the photometric scatter due to a magnitude error of 0.1 and 0.2, respectively, in the bands considered (equivalent to ~10% and ~20% error in flux, respectively).