Left: line profiles of He II plotted on a velocity scale corrected for the adopted −179 km s⁻¹ systemic velocity. The continuous line shows the strong λ4686, with its extended electron scattering wings, and λ5411 with its strong P Cyg absorption. The dashed line is λ4541, which is contaminated on the blue wing with N III. Right: He I lines profiles of λ4471 (continuous, black), λ5876 (dash, black), λ6678 (dot, red), and λ7065 (continuous, red). The vertical lines indicate the approximate locations where the line meets the continuum level.