Radially averaged vertical density profiles in our four simulations (dashed lines show gas densities; solid lines show dust densities). While the ideal VSI simulation and the simulation with thermal relaxation but no backreaction maintain a vertically extended dust layer (black and light red), we find strongly sedimented midplane dust layers in the simulations that consider backreaction (blue and dark red). The legend shows the included physical effects in the respective simulation (thermal relaxation, backreaction, and hot atmosphere).