Predicted luminosity of CIII] 1909 Å as a function of the total SFR (SFR_UV+IR) for k_s = 0.34 (left panel) and k_s = 5 (right panel). The colours correspond to 1–2σ dispersion. The central region between the dashed grey lines represents the SFR range of the ALPINE subsample modelled in this work. Red and blue represent the two SFHs considered in this work: continuous and Δt_q = 5 Myr. The black points are the observed data from Llerena et al. (2023), the blue points from Markov et al. (2022).