¹²CO J = 6−5 channel map around v_source = 4.55 km s^-1. Channels are binned to 1 km s^-1. Black lines show isovelocity contours of the border velocity of each velocity bin assuming Keplerian rotation with parameters in Table 1. Channels between 2.55 and 4.55 km s^-1 are affected by foreground absorption. Black arrows indicate regions with clear deviations from the Keplerian pattern (see Sect. 3.2). Ellipses indicate radii of 20 and 60 AU. Red contours give the continuum (5σ,10σ,100σ,200σ,300σ detections).