Distribution of Sérsic indices, n_S^, in the UVJ color space for different redshift ranges, for galaxies with log M_★/M_⊙ > 10. The color of each hexagonal bin represents the median value of n_S, as indicated by the colorbar. The dotted line shows the quiescent vs. star-forming separation using Eq. (2). The quiescent region is predominantly populated by galaxies with high Sérsic indices (n_S > 3).