Ratio between nonlinear (measured) P_NL and the linear (predicted) P_Lin power spectra in the ΛCDM case (∑m_ν = 0) and for the three neutrino masses (∑m_ν = {0.17,  0.3,  0.53} eV). The density–density, density–velocity divergence, and velocity divergence–velocity divergence spectra are represented by blue solid, red short dashed, and green long dashed lines, respectively. Each row shows the redshift evolution of these ratios (from top to bottom panels: z = 0, 0.5, 1. and 1.5.)