Power spectrum of density fluctuations of each matter component in the nonradiative gas simulation (bottom) and in the gas cooling and star formation simulation (top), at redshifts z = 1 and z = 0. The results are compared with the spectrum of the pure dark matter simulation (black solid lines). The colored dotted lines, short‐dashed lines, long‐dashed lines, and solid lines are plotted for the dark matter, gas, stars, and total matter density field, respectively.