Departure coefficients, fractional net rates, and line profiles for N ivλ4058/λ6380 and involved processes, for model “A4540”. Designation for 2p² refers to 2p^2 2D only since the other fine-structure component, 2p^2 2S, behaves similarly. Upper panel: NLTE departure coefficients as a function of τ_Ross. The onset of the wind is clearly visible at τ_Ross  ≈  0.003. Black curves: standard model with b_3d > b_3p; red curves: draining transitions 3p  →  2p² suppressed, leading to b_3d < b_3p; blue curves: transition 2p  →  3d suppressed. Middle panel: fractional net rates to and from 3p, for the standard model (black) and the model with suppressed draining transitions (red). Lower panel: line profiles for N ivλ4058 and λ6380, for the three models displayed in the upper panel, with similar color coding.