Top panel: median axis ratio of early-type galaxies more massive than log( M/ M _☉) > 10.7 as a function of redshift. The sample presented in this paper is represented by the colored data points; the black data points are taken from the literature as indicated. The error bars are estimated by bootstrapping. Bottom panel: fraction of galaxies with axis ratios smaller than indicated, again as a function of redshift. Beyond z ~ 1, early-type galaxies typically have smaller axis ratios than present-day counterparts in the same mass range, indicative of a more disk-like structure. All error bars are inferred by the 95% confidence level compared to the same fraction.