CO 6−5 PV diagrams. Top: PA = 135° close to the major axis of the nuclear disk. The curves show the Keplerian rotation curves of a 106, 3 × 106, and 6 × 106M⊙ SMBH. Bottom: cut perpendicular (PA = 45°) to the nuclear disk. The contour levels are 25 × (1, 2, 3) mJy beam-1. Colours range from 25 to 90 mJy beam-1. A velocity of 0 km s-1 corresponds to 1743 km s-1.
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