Relative orientation parameter, ξ_BV, as a function of particle density, n ≡ ρ/μ, in the simulations used in Soler et al. (2013). The values of ξ_BV correspond to the relative orientation between B and v in n-bins with an equal number of voxels, all with n> 500 cm^-3. The values ξ_BV> 0 correspond to B mostly perpendicular to v and ξ_BV< 0 correspond to B mostly parallel to v. The gray horizontal line is ξ_BV = 0, which corresponds to the case where there is no preferred relative orientation between B and v. The colors and the symbols represent the initial magnetization values quantified by β₀. The darker colors represent the early snapshots in the simulation and the lighter colors represent the later snapshots. The gray vertical line, drawn for reference, corresponds to n = 10⁴ cm^-3.