X-ray surface brightness profiles of the FULL_phot sample after subtracting background, without masking sources. The results are divided into galaxy mass bins log(M_*) = 10.0 − 10.5, 10.5–11.0 (MW-mass), and 11.0–11.025 (M31-mass) as labeled. The dotted line is the PSF of eROSITA, and the vertical dash-dotted line denotes the average virial radius of stacked galaxies. The X-ray emission comprises all effects mentioned in Sect. 3.6, limiting its interpretability regarding CGM emission. The X-ray surface brightness profile measured by stacking 16 142 galaxies with log(M_*) = 10.4 − 11.0 and z_spec = 0.05 − 0.3 is plotted in gray (Comparat et al. 2022). The galaxy sample in Comparat et al. (2022) contains a complete population of AGN (while our FULL_phot does not contain sources that appear point-like in the legacy survey photometry) and has a broader PSF due to its higher mean redshift. So we expect the previous measurement to agree with the FULL MW-mass at large separation but to be brighter in the center.