RAYGAL real-space matter power spectra. Left: 3D matter power spectra at z = 0 (top lines in black and red) and z = 1 (bottom lines in green and blue) for ΛCDM (continuous lines) and wCDM (dashed lines) cosmologies. RAYGAL power spectra are shown in black (z = 0) and green (z = 1), and emulator power spectra are shown in red (z = 0) and blue (z = 1). Right: relative deviations between simulations and emulator at z = 0 (black) and z = 1 (green) in ΛCDM (continuous lines) and wCDM (dashed lines) cosmologies. Percent level agreement is shown up to k = 1−2 h Mpc⁻¹, where resolution effects damp the power spectrum. Baryonic effects are also expected to damp the power spectrum near this wavenumber.