The ratio of missing-to-observed baryonic mass as a function of baryonic mass. Data and symbols are the same as in Figure 3. The ratio is linear in the bottom half of the diagram, then switches to logarithmic in the top half. Spiral galaxies of the WISE-SPARC sample are shown twice: once with f_v = 1.0 (solid blue circles) and again with f_v = 1.4 (small open circles). The Milky Way is the yellow point at the top of the gray band, which shows the range from zero CGM to that required to explain all of the locally missing baryons when f_v = 1. Stars represent the CGM measurements of Milky Way–mass galaxies by M. J. Miller & J. N. Bregman (2015), J. N. Bregman et al. (2022), and Y. Zhang et al. (2025b) from bottom to top.