Same as Fig. C.1, but for A_*, which governs the peak-star-formation efficiency in haloes. Lower-right panel: A_* effects the overall abundance of stellar mass, but not the ratio in central and satellite stellar mass. There is some back reaction on the gas abundance that occurs in order to keep the baryon fraction universal, so that halo gas is slightly depleted as a result of this boost, so there is a small effect on gas profiles. The effect on the halo profiles can be seen in the top right panel. Increasing A_* boosts star-formation efficiency, which has a fairly uniform effect on the amplitude of any power spectra involving the star density as can be seen in the top two panels in the left-hand column. There is an effect on the matter–matter spectrum at small scales as stars start to dominate the power. The effect on electron pressure is minimal, but not non-existent due to the gas abundance being affected.