Diagnostic diagrams for group ID 4. Left: SFR versus stellar mass with LTGs (blue squares) and ETGs (red circles); the gray cross indicates typical uncertainties and the cyan dashed line shows the Popesso et al. (2023) main sequence. Middle: rest-frame color–color diagram. Crimson dashed line segments define an empirical, trapezoidal boundary separating the galaxy population into blue star-forming, red star-forming (green-shaded), and quiescent (red-shaded) regions. To highlight the key non-blue populations, galaxies are marked on all panels with a thick green square outline (red star-forming) or a thick red square outline (quiescent). Right: color–magnitude diagram with orange line and pink shaded area marking the predicted red sequence locus at z_DET ± 0.25 mag.