Effect of mass resolution in the PM runs: total projected density on (x, y) plane of the simulations of three crossed sine waves with ϵ = (3/4, 1/2). Except for the top panel which represents the last snapshot of the highest resolution Vlasov run, each row of panels corresponds, for various expansion factors, to a different number of particles, , with n_p = 1024, 512, 256, and 128 (from top to bottom). The spatial resolution is n_g = 512 for all the simulations, except for the first row of panels, where it is n_g = 1024. The images are computed from the projection on the (x, y) plane of the density calculated on a 512³ mesh spanning a cube of size L_sub = L/10 in the left panels and L_sub = L/2.5 otherwise, by using the nearest grid point interpolation. The logarithmic colour table goes from dark blue to white, then to dark red. The mass, hence the contribution of each particle, increases with dilution, which explains the change in colour towards dark red of the individual particles in underdense regions when n_p decreases. The simulations considered are designated (from top to bottom) as VLA-ANI2-FHR, PM-ANI2-UHR, PM-ANI2-HR, PM-ANI2-HR-D8, and PM-ANI2-HR-D64 in Table 1.