Compensated power spectra P_kk^2.67 for n (left) and v_z (right) computed on 1024N01 (black solid line) and on the isothermal simulation (black dashed line). The red lines indicate the power law fits done on the range of k given in Table 5. These power spectra are the average of all the P_k computed on each slices along the z-axis (see Fig. 19). The blue error bars indicate the dispersion at each k value.