Empirical moments of the LoTSS-DR1 radio source catalogue (left), DR1 value-added catalogue (middle left), the LoTSS-DR2 radio source catalogue (middle right), and DR2 value-added catalogue (right). We show the clustering parameter (n_c, orange), skewness (g₁, blue), and excess kurtosis (g₂ − 3, brown) for the HETDEX field of DR1 and DR2 with ‘mask 1’, ‘mask 2’, and ‘mask 5s’ of Siewert et al. (2020).