Baryon mass detected through different tracers as summarized in Table A.1 and Appendix A. The baryon masses are measured for the MW or L_* galaxies (noting that the definition of L_* varies across studies, spanning a broad range in stellar and halo mass). For reference, we take a stellar mass of 5.5 × 10¹⁰ M_⊙. Dark and light purple bars indicate the lower and upper limits of detected baryon mass, respectively. The upper limit derived in this work excludes the case of an isothermal T = 0.08 keV. The gray line (and shaded bar) denotes the expected baryon mass of galaxies with M_h = 1.3 × 10¹² M_⊙ (1 − 1.6 × 10¹² M_⊙).