Relation between the half-light radius (r_1∕2) and thestellar mass for ZFOURGE galaxies with HST coverage (80% of the whole sample). Jekyll and Hyde are shown as blue and green squares, respectively, and are compared to other z = 4 galaxies in the same field (Straatman et al. 2015). SFGs are shown in blue, quiescent galaxies in red. The half-light radii are derived from the Hubble F160W imaging (hence, rest-frame U band) for all galaxies except Hyde, for which the radius is that of the dust continuum.