X-ray fluxes from line-of-sight galaxies (blue) and diffuse gas (orange) in different subregions. Panels from left to right correspond to the three cases: targeting a galaxy, a group, and a cluster (as given in Fig. 2), respectively. The shaded areas represent the fluxes between 0.4 keV and 0.85 keV. The dashed lines represent the mean values of the fluxes among five subregions in each case. The dotted lines represent the mean values in the shaded parts.