Relative orientation parameter, ξ, as a function of the Alfvén Mach number, ℳ_A, in the simulations introduced in Soler et al. (2013). The darker colors represent the early snapshots in the simulation and the lighter colors represent the later snapshots. The values ξ> 0 correspond to ∇ρ mostly perpendicular to B and ξ< 0 correspond to ∇ρ mostly parallel to B. The gray horizontal line is ξ = 0, which corresponds to the case where there is no preferred relative orientation between ∇ρ and B. The gray vertical line, drawn for reference, corresponds to ℳ_A = 1, which marks the border between sub-, ℳ_A< 1, and super-Alfvénic, ℳ_A> 1, turbulence.