Halo-model predictions at z = 0 for the matter–matter (top), CDM–CDM, gas–gas, stars–stars and the matter–electron pressure (bottom) power spectra. We also show the two-halo (long-dashed) and the one-halo (short-dashed) terms for each spectrum apart from matter–matter. At large scales, the shapes of the two-halo terms are all identical, and are that of the linear power spectrum, at small scales the one-halo terms dominates and have significantly different shapes for each spectrum. Note that the transition scale between the two- and one-halo term is at much larger scales for the matter–electron pressure cross spectrum, which is a consequence of this spectrum being dominated by contributions from more massive haloes compared to those that contribute to the matter spectra. The down-turn at small scales in the gas–gas and matter–electron pressure spectra is partly due to the underrepresentation of low-mass haloes and partly due to their relatively smooth halo profiles.