Scatter plots of v_rot(r_eff)/σ₀ as a function of effective radius (left) and Sérsic index (right) for disk (orange circles) and nondisk (blue squares) galaxies. The histograms above each panel show the normalized distributions of effective radius and Sérsic index, while the histogram on the right represents the distribution of v_rot(r_eff)/σ₀. The red horizontal lines indicate reference values at v_rot(r_eff)/σ₀ = 1, 3, and 10.