VLBA-to-VLA AGN flux density ratio vs. 1.4 GHz AGN luminosity. Yellow circles show the luminosity binned values of the ratio, while solid and dashed black lines show the median, 84th and 16th percentile values of the sample with L_{1.4 GHz, TOT} ≥ 10^24.4 WHz⁻¹. Blue, green, and magenta circles and error bars show the data in three redshift bins as indicated in the legend. For better visibility of error bars, we introduced a small shift along the luminosity axis.