Contribution of the two [CI] transitions to the Poisson term (left panels) and large-scale power spectrum (right panels) before (upper panels) and after (lower panels) masking the known galaxies from surveys. The solid black line represents the total, while the dotted red line and the dashed blue line correspond to the [CI](1–0) and [CI](2–1) transitions, respectively. For a better visualization, we smoothed the curves by a Gaussian kernel with a σ of 3 GHz.