The first three panels show the effective sizes calculated in the rest-frame U-band, rest-frame V-band, and using the stellar mass distribution, as a function of total stellar mass. Galaxies are color-coded according to the populations defined in Section 2.2. For the star-forming population we only show 80 randomly drawn galaxies; we also omit the intermediate quiescent population from the first three panels for clarity. Stars mark the median values for each population. The last panel shows the ratio of half-mass and half-light (in the rest-frame V-band) size as a function of stellar age, for the three subsamples of quiescent galaxies. Star symbols mark the medians for the TNG galaxies, and empty circles mark the medians for the Suess et al. (2020) observed sample at 1.5 < z < 2.5. The 30th–70th percentile regions for both the simulation (hatched) and observations (shaded) are shown. The data and software to generate this Figure are available on Zenodo:10.5281/zenodo.5093727 (GitHub: https://github.com/pathakde/Pathak_2021).