Redshift evolution of the circularized effective radius R_e for SFGs with z >  1. Blue filled circles are the radio R_e from our sample of radio-emitting SFGs, magenta triangles and green squares are the rest-frame FIR R_e from Fujimoto et al. (2017; F17) and Tadaki et al. (2017; T17), purple diamonds are the UV median values from Shibuya et al. (2015; S15). The errors on the radio R_e also include the dispersion of the axial ratio median value we used to convert into circularized effective radius. The solid line is the best-fit median size evolution derived for R_e in the UV-band for UV-luminous SFGs by S15, given by R_e = B_z(1 + z)^β_z, with B_z = 4.05 and β_z = −0.78.