Time series of the surface density for our reference simulation. Time advanced from left to right and top to bottom. The dashed white circles are of radius r = 0.6 au and r = 1.5 au, respectively, and are meant to highlight the eccentric nature of the gap. We note that this plot does not show the full simulation domain, which extends further out to 5 au. Panel A shows the state at the end of the relaxation process for our reference model. A zoomed close-up version of this figure can be found in Fig. C.1.