Convergence of the truncated eigenvalues Λn and coefficients of the eigenvectors un as the truncation level D increases, for K = 3 with low mutation rates. Subfigures (a) and (b) show for σ = σ1 and σ = σ2, respectively. Subfigures (c) and (d) show for σ = σ1 and σ = σ2, respectively. The mutation rates were set to θ = (0.01, 0.02, 0.03) for all computations.