Midplane rotational structure for the run C1 with |v|∕v_Kep as contours. After gas from the FFR enters the CPD, it encounters one of the spiral arms and is shocked towards higher values of |v|∕v_Kep. This resultsin a de-facto isolation between on one hand the infalling material into the FFR and on the other hand the planet in the midplane. This material nevertheless does find its way into the planet through a complex vertical circulation, as is clear from the streamlines in Fig. 10. The blue, dashed circle marks the gravitational smoothing length.