As the sliding scale k is lowered, the flowing action Γ Γ k evolves in the theory space according to the functional flow equation. The choice of the regulator R k is not unique, which introduces some scheme dependence into the renormalization group flow. For this reason, different choices of the regulator R k correspond to the different paths in the figure. At the infrared scale k = 0 , however, the full effective action Γ Γ k = 0 = Γ Γ is recovered for every choice of the cut-off R k , and all trajectories meet at the same point in the theory space.