150 MHz Euclidean normalised differential number counts for SFGs from SEMPER. The solid black line (hatched area) represents our model obtained adopting Eq. (8) (Eq. 7, scaled to 150 MHz using a spectral index range −0.8 < α < −0.6). The cyan and pink solid lines represent predictions from the T-RECS simulation (Bonaldi et al. 2019, 2023) and the model from Mancuso et al. (2017), respectively. Circles are the differential source counts we computed from the LoTSS deep fields DR1 catalogues.