Velocity channel maps for the synthetic ¹²CO(3−2) emission line maps. From left to right: VSI-unstable disk without a planet, VSI-unstable disk with a Saturn-mass planet, α-viscous disk with a Saturn-mass planet, VSI-unstable disk with a Jupiter-mass planet, and α-viscous disk with a Jupiter-mass planet. From top to bottom: Predictions for different disk inclinations are presented (i = [5°, 15°, 30°]). The α-viscous models are run for a = 5 × 10⁻⁴. The approximated location of the planets is indicated with black circles, of the size of the planet’s Hill spheres. Displayed are channels that overlap with the location of the planets. A short movie of all the velocity channel maps is available online.