150 MHz LF for SFGs from SEMPER at z ∼ 0. The model is obtained from Eqs. (7) and (8) (hatched grey area) using a spectral index range of α = [ − 0.8, −0.6] and by applying Eq. (11). Data points are from Sabater et al. (2019), Bonato et al. (2021a) and Cochrane et al. (2023) at 150 MHz and Ocran et al. (2020a) at 640 MHz (rescaled assuming α = −0.7). The dotted line refers to the best-fit modified Schechter function presented in Cochrane et al. (2023). The shaded area is from the T-RECS simulation (Bonaldi et al. 2019, 2023).