Left: position–velocity plot of the CO(1−0) taken along , i.e. along the direction of the inner parts of tails and almost perpendicular to the radio jet. The data cube used has a resolution of 009 × 0055 and a velocity resolution of 120 km s⁻¹. Negative position offsets are south of the core. Contour levels are 0.12 (1.5σ), 0.24, 0.36 and 0.48 mJy beam⁻¹. Right: position–velocity plot of the CO(1−0) centred in the core in the direction of the radio jet (PA = 77°). negative offsets are E of the core. Contour levels are 0.12 (1.5σ), 0.24, 0.36 and 0.48 mJy beam⁻¹.