Envelope of a growing planet at three different mass stages (left 30M_E, centre 100M_E, right 330M_E). The azimuthally-averaged density-weighted mean velocity () in the vertical and radial direction is represented by the vector field, using a linear scaling for the magnitude that is also given by the greyscale spectrum bar on the top of each panel. The contours show the angular momentum ratio with respect to Keplerian rotation, measured in non-rotating co-moving frame. The temperature field is colour coded in the background. Left panel: 30 M_E -planet experiencing a high mass flux through the poles, which moves away from the planet in the midplane (Lambrechts & Lega 2017). Centre panel: higher mass planets also experience a high flux of gas entering through the poles, but the processof gap formation changes the mass transport and the angular momentum distribution. Right panel: Jupiter-mass planet with the horizontal grey dashed line marking where the azimuthally averaged optical depth reaches τ = 2∕3.