The simulation on the right was completed using a Brownian dynamics simulation. Starting with a Langevin equation for the system, m x ¨ ¨ = − − γ γ x ˙ ˙ − − c + σ σ ξ ξ ( t ) where γ γ is the friction term, ξ ξ is a fluctuating force on the particle, and σ σ is the amplitude of the fluctuation. At equilibrium the frictional force is much greater than the inertial force, | γ γ x ˙ ˙ | ≫ ≫ | m x ¨ ¨ | . Therefore, the Langevin equation becomes, γ γ x ˙ ˙ = − − c + σ σ ξ ξ ( t )