150 MHz Euclidean normalized differential source counts as derived from the LoTSS Deep Fields: raw catalog are indicated by transparent black circles and final catalog by blue crosses. Also shown are the counts obtained from the TGSS-ADR1 (Intema et al. 2017, orange filled circles), which better describe the counts’ bright end. Over-plotted is the best fit obtained by modeling the counts in the log–log space with a 7th order polynomial function, according to Eq. (13) (see Table 4 for the values of the best-fit coefficients and associated errors).