Surface mapping of the intensity of the absorption lines. The orbital phase (with 0.5 corresponding to the superior conjunction when the companion is located in front of the giant) are marked at their corresponding viewing angle. Left: He I line following the accretor showing that the absorption deepens at the stream-disk impact (ϕ = 0.6–0.9). Right: O I line following the donor showing that the absorption deepens on the side facing the AD (ϕ = 0.4–0.6).