Summary statistics of the inferred effective-spin distributions across the four mass intervals identified from the mass-ratio analysis: m₁ < 18 M_⊙, 18 < m₁/M_⊙ < 30, 30 < m₁/M_⊙ < 50, and m₁ > 50 M_⊙. Error bars indicate the 90% credible intervals. The upper panel shows the mean, median, and mode of the inferred χ_eff distributions, while the lower panel shows the corresponding Pearson first skewness coefficient. The latter is computed with respect to the mode of the distribution.