Intrinsic brightness temperature, T_int, of AGNs obtained at different ν^o. Values with the label “pop” were obtained from a population analysis of T_vlb and β_app. Values with the label “var” were obtained utilizing flux density variability. All values were scaled to correspond to a disk source geometry. The dashed horizontal line corresponds to the T_eq ≈ 5 × 10¹⁰ K of Readhead (1994). The values of Lee2014 are from Lee (2014), Nair2019 from Nair et al. (2019), Homan2021 from Homan et al. (2021), and Liodakis2018 from Liodakis et al. (2018), and they have been adjusted for the source geometry.