Linear (thick lines) and nonlinear (thin lines) evolution of the three-dimensional total matter power spectrum computed from the best-guess realization (black lines) and from runs with massive neutrinos with M_ν = 0.1,0.4, and 0.8 eV (dotted, dashed and long-dashed lines). Six intervals in redshifts are considered, from z = 2.2 to z = 3.2, with a spacing of Δz = 0.2.