Distribution functions of the components B_x, B_y, and B_z of a model magnetic field B = B₀ + B_t built on a grid 120 × 120 × 120 pixels using Eq. (8) with β_A = 5, and a mean, large-scale magnetic field B₀ defined by the angles χ₀ = 0° and γ₀ = 60°, and a norm B₀ = 50 μG such that the fluctuation level is y_B = 0.1. The vertical lines represent the projected values of the large scale magnetic field B_0x = B₀ sinχ₀ cosγ₀, B_0y = −B₀ cosχ₀ cosγ₀ and B_0z = B₀ sinγ₀. See Fig. 14 in Planck Collaboration Int. XX (2015) for the definition of angles.