Evolution of the gas and dust velocities for a Collisions test with 20 dust fluids obtained with the EXP solver and compared to the analytical solution given by Eq. (27) (dashed black lines). For the first five dust species, their stopping time is short, such that they are strongly coupled to the gas. We therefore chose to plot the first and the fifth species. In addition to the 6th dust species, we chose to skip every second fluid from the 10th to the 20th dust species.