Ratio with respect to the massless case (ΛCDM) of the quadrupole of the halo power spectra (symbols with error bars) compared to the corresponding ratios for matter (solid lines) for different neutrino masses. The stars represent the result for the fixed bias selection, while the circles correspond to the selection at fixed mass threshold. The divergence at k ≃ 0.3 h⁻¹ Mpc is caused by a zero-crossing of the quadrupole.