2D distribution of the spin sampling for the case of the mass correlated model. Top figures: Individual spin amplitudes χ₁ (left) and χ₂ (right) as a function of the mass ratio q. Bottom: Effective spin amplitude, χ_eff, as a function of the mass ratio, q. The distributions are calculated with α_s = 0.013,β_s = −1.53,χ₀ = 0.2, σ₀ = 0.52. The mass distribution is the power-law+Gaussian distribution seen in A.1.