Relative difference between the analytical and random catalogue-based mean ⟨RR⟩ pair-count multipole moments (ℓ = 0, 2, 4, in the top, middle, and bottom panels, respectively) for BOSS. The grey shaded area shows the standard deviation among the random catalogues, while blue, orange, green, red, and purple curves present the relative differences obtained with vegas, suave, divonne, cuhre, and gsl algorithms, respectively, when using ε = 10⁻⁵.