X-ray scaling relation prediction of the cluster and group model. Top panel: Scaling relation between X-ray luminosity obtained by integrating the emission measure profiles (see Eq. (11)) and halo mass. Bottom panel: Scaling relation between temperature and halo mass. The blue shaded area shows the 16th–84th percentile distribution for the model applied to the Uchuu light cone in each mass bin. Our model is compared to a collection of real groups and cluster samples. The bottom part of both panels shows the intrinsic scatter evolution as a function of halo mass.