Comparison of the power spectrum of the HOD model and the SAM catalog. On the left, we show the H I power spectrum. The solid lines represent the power spectrum measured from the SAM galaxy catalog, and the dashed lines represent the power spectrum measured from the HOD model. “Real” means the real-space point-mass power spectrum, “red” means the redshift-space point-mass power spectrum, and “red2” means the redshift-space inside the galaxy H I distribution modeled power spectrum (Zhang et al. 2020). On the right, we show the power spectrum ratio of the results of the HOD model and the SAM galaxy catalog.