Three-dimensional matter power spectra with massive neutrinos, normalized by their corresponding massless neutrino power spectra at the same resolution. The top panel represents M_ν = 0.1 eV, the middle panel denotes M_ν = 0.4 eV, and the bottom one shows M_ν = 0.8 eV. The almost straight lines denote linear theory expectations. Note the characteristic scale- and redshift-dependent suppression of the 3D power caused by the neutrino free-streaming.