Absolute values of the field line bending forces, ⟨⟨|(B ⋅ ∇)B_x, y|⟩_xy⟩_t (solid curves), and the self-gravity forces, ⟨⟨|ρ∂_x, yΦ|⟩_xy⟩_t (dashed curves), in directions x (red) and y (blue), evaluated for simulation sg-mhd-tau20. The time average is over the interval 800 ≤ tΩ₀ ≤ 1300. The force densities were calculated using finite differences from the full three-dimensional output data of Athena every 10. We note that μ₀ = 1 in code units.