Mean X-ray surface brightness profiles of central galaxies (with a magnitude limit of r_AB < 17.77) after subtracting background and masking X-ray point sources, for galaxies with log(M_*) = 10.5 − 11.0 (MW-mass), 11.0–11.25 (M31-mass), and 11.25–11.5 (2M31-mass) shown on the left. The X-ray emission comprises unresolved point sources and hot gas. $\overline{z}$ is the median redshift of galaxies in each mass bin. The dotted lines are the PSF of eROSITA. The vertical dash-dotted lines are the virial radius at different stellar mass bins correspondingly. Right panel shows the mean X-ray surface brightness profiles of central galaxies with log(M_200m) = 12.0 − 13.5 after subtracting background and masking X-ray point sources.