Brightness temperature perturbation power spectrum at z = 0.13 (solid lines) and z = 0.45 (dashed lines) with a 9.33 MHz bandwidth. The auto-spectra of the full signal (black) and of each individual term are shown, generically grouped as Newtonian-gauge density (red), redshift-space distortions (green), velocity term (blue), all potential terms evaluated at the source position (cyan), and the ISW component (magenta). The power spectrum is dominated by the H I overdensity at small scales and has a significant contribution from RSD at large scales.