Mean X-ray surface brightness profiles in the stellar mass bin M_★=[10^10.5, 10¹¹] M_⊙, corresponding to MW-like galaxies. The locally correlated large-scale structure contributions are shown by comparing the profiles obtained with photons selected within ±R_200m (purple) and those obtained within ±3 Mpc (solid black), ±9 Mpc (solid grey), ±27 Mpc (dashed grey) away from the halo centre. The crosses are from previous work by Oppenheimer et al. (2020), where they generate mock X-ray observations using TNG-100. The vertical dashed line at 242 kpc and the dotted line at 525 kpc is the mean R_500c and R_200m, respectively, of the 5109 galaxies used in the mass bin with the shaded area corresponding to the minimum and maximum R_500c values. The shaded uncertainties on the profiles represent the variance obtained by bootstrapping.