Maps of the [CII] emission obtained with the PdBI in 60 km s^-1 wide channels. The central velocity of each map (in km s^-1) is indicated in the upper left corner in units of km s^-1. Contour levels are shown in steps of 1.5σ, where 1σ = 0.2 Jy km s^-1 beam^-1. Negative contour levels of 1.5σ are represented through dotted lines. Source C reveals a complex velocity pattern, suggestive of rotation disturbed by the interaction with the quasar host galaxy (A+B).