Visual examples of snapshots at z = 2.2 from simulations with a box size of 25 h^-1 Mpc and a resolution of N_p = 192³ particles per type. The upper top panels are full projections of the density field in the x and y directions across z from our best-guess reference simulation without massive neutrinos (but with a massless neutrino component), while in descending order the other panels are for M_ν = 0.1,0.4, and 0.8 eV. Gas (left panels), dark matter (central panels), and neutrino (right panels) components – when present – are shown. The axis scales are in h^-1 Mpc. The various plots are smoothed with a cubic spline kernel, and both the DM and neutrino components are treated in the same way as the gas. See the text for more details.