Spectral region of the H-like O⁷⁺ and C⁵⁺ Lyα lines demonstrating the contribution of the three absorption components (marked in figure) and a broad (FWHM = 1400 km s^-1) emission component (not marked) centered at –450 km s^-1. The instrumental spectral resolution is ~1000 km s^-1 at the O⁷⁺ line and ~600 km s^-1 at the C⁵⁺ line, as can be seen from the folded model (solid line). Note that the vertical flux scale does not go down to zero.