Mean broad O VI emission from the 2003 data, with the reflected profile (dotted line) superposed. Fluxes are in ergs cm⁻² s⁻¹ Å⁻¹. To create this profile, we have edited out the sharp emissions and absorptions. The center of the broad line is arbitrarily set to zero velocity. The reflection wavelength is chosen to maximize the broad feature symmetry. Note that the center of the broad profile is positively displaced with respect to the average position of the narrow O VI emission by ~500 km s⁻¹, as discussed in the text.