Brightness temperature distribution with respect to redshift. The black circles and red squares correspond to those sources detected with a ∼5.3 × 4.5 mas restoring beam and those detected with a ∼16 × 16 mas beam respectively. Arrows correspond to the lower limits for sources classified as unresolved (that is either θ_maj or θ_min is less than the minimum resolvable size). The histogram shows the distribution of brightness temperatures which is colour coded with the markers. The majority of brightness temperatures are between 10⁶ and 10⁸ K.