Radio power vs. redshift for our VLBI sources. 1σ uncertainties on radio power and redshifts are plotted. The bold black curve represents the theoretical radio power that these VLBI observations are sensitive to (assuming all the VLA flux is contained in a milliarcsecond core) corresponding to 54 μJy beam⁻¹ or 6 × VLBI central rms The region above the blue shaded area represents the AGN dominated regime defined using the selection criteria of Magliocchetti et al. (2018). The histogram shows the distribution of the radio powers of which peak between 10²⁴ and 10²⁵ WHz⁻¹.