Selected ¹²CO J = 2−1 synthetic channel maps for the three simulation snapshots (0.3, 1.0 and 3.0 M_Jup, from top to bottom), with the planets at R_p = 100 au radius, and ϕ_p = 45° azimuth, marked as green circles. The disc is inclined at − 45° with respect to the plane of the sky. The thin grey line is the projected circular orbit of the planet. The solid lines are centroid velocity contours extracted from the simulations at the velocity channel indicated on the top header; the dashed lines show the same but for the Keplerian best-fit model. Small arrows indicate kink-like features identified by visual inspection. In the bottom row a zoom-in around planets is shown for better comparison of centroid velocities and their deviation from Keplerian rotation as a function of planet mass.