A refer to Reiner et al. 2007:
http://adsabs.harvard.edu/abs/2007AGUFMSH42A..02R
Below, I copy figures 1 and 4 from the paper. The authors discus the "intrinsic physical characteristics of these radio sources, such as the brightness temperatures and beaming characteristics, at different observing radio frequencies".
http://adsabs.harvard.edu/abs/2007AGUFMSH42A..02R
Below, I copy figures 1 and 4 from the paper. The authors discus the "intrinsic physical characteristics of these radio sources, such as the brightness temperatures and beaming characteristics, at different observing radio frequencies".