Sum of the “cleaned” [O III]λλ4959,5007 profiles (cf. Fig. 16) of the emission from 0540 (black) compared to the observed emission (blue). The velocity scale is for the λ5007 component relative to LMC. The difference (red) is attributed to [Fe III] λ4986. The maximum velocity on the red side of [O III] λ5007 is ≈ + 1800 km s⁻¹, which may be less than on the blue side (≈ − 1900 km s⁻¹, see Fig. 16).