Evolution with redshift of the main RS parameters for our group sample. From top to bottom: the first panel shows the average observed color as in Table 2, compared to our reference m_★(z) model (orange lines). The star shows the CW117 detection, which has RS color compatible with that expected at that redshift for typical RS galaxies; the second panel shows the slope, with all groups in gray and those with RS in red; the third panel is a zoom on the slope of RS-groups only, with the parameters as retrieved using observer-frame (red points and orange fit line) and rest-frame magnitudes (blue point and fit line); the fourth panel shows the same but for the scatter of RS-groups. The yellow star shows the RS parameters of CW117, in the observer frame (red contours) and the rest frame (blue contours).