Density distribution of the gas (top left), the lightest dust species (top right), and the heaviest dust species (bottom left), as well as the vorticity of the gas fluid (bottom right) at t = 60 in a simulation with δ = 0.01 and κ = 0.7968. Only part of the total domain is shown. In the image, the merging of two vortices is ongoing. A clear connection can be seen between the vorticity of the gas and the distribution of the smallest dust species.