Contributions of the different ions to the radiative acceleration of a hydrodynamically consistent, hydrogen-free WN model with T_* = 130 kK, log L/L_⊙ = 5.7, M = 20 M_⊙, and D_∞ = 50: Different ions are denoted by a combination of different color and symbol. The total radiative acceleration (a_rad), the Thomson acceleration from free electrons (a_Thom = Γ_e · g), and the contribution from gas (and turbulence) pressure (a_press) are also shown for comparison. The loosely dashed horizontal line denotes the total Eddington limit that needs to be overcome to launch a wind.