Distribution and correlation of κ_rot vs. λ_R, intr (upper) and f_spheroid vs. λ_R, intr (lower) measured within different regions from left to right. The solid red and blue curves show the best-fit results for the TNG50 and TNG100 datasets, respectively, while the dashed curves represent their 2σ confidence interval. The corresponding fitting coefficients and σ values are listed in the bottom-right corner of each panel. In the lower panels, we additionally provide the Pearson correlation coefficient (r_p). The r_p ∼ −1 value indicates a strong anticorrelation between λ_R, intr and f_spheroid.