Bias models used in this work as a function of redshift in the range z = [0, 3] for the NVSS (top panel) and TGSS (bottom panel) cases. Curves with different colors and line styles are used for the different combinations of N(z) and galaxy bias models, as indicated in the labels. The values of the free parameter, b_g, are listed in Tables 6 and 7 for TGSS and NVSS, respectively. We also consider “truncated” versions of the HB and PB models, in which the value of the bias for each population of sources is kept constant for z ≥ 1.5 (dashed lines).