Upper panel: density averaged over the last 100 orbits for the VSI simulation with M_p = 5 M_⊕ in units of initial density. Lower panel: density averaged over the last 100 orbits for the VSI simulation with M_p = 10 M_⊕ in units of initial density. In both cases an increase in density before the planet is visible, if only barely for the 10 M_⊕ case. The bump in density does not move over time.