Evolution of the stellar mass surface density, Σ_e. Shown are masses and redshifts from the DJA, calculated using EAZY, and effective radii, r_e, measured by SOURCEXTRACTOR++ in this work. Galaxies are classified as quiescent or star-forming according to their position in the UVJ diagram. The contour lines result from kernel density estimation using seaborn.kdeplot. The data for this figure includes 45 201 galaxies such that log M_★/M_⊙ > 9.