Residual intrinsic scatter of T_dust, obtained after removing the redshift evolution (Eq. (15)) and starburstiness dependence (Eq. (18)), and subtracting statistically the uncertainty on the T_dust measurements and on the redshift. Measurements of the scatter in CANDELS and ALESS are shown with solid circles, and the HRS is shown with a solid triangle. The trend with redshift is modeled as a constant relative uncertainty (black line).