Median baryon fraction at all redshifts (plotted in gray) and at the three overdensities: 200 (top panel), 500 (central panel), and 2500 (bottom panel). Subsamples at z = 0.07, z = 0.59, and z = 1.32 are in dark pink, green, and blue, respectively. Solid red, dot-dashed brown, and dashed light-blue lines represent the best-fit results using the (1 + z) dependence as in Eq. (5) for the three functional forms at z = 0 and z = 1.32 (parameters in Table 2). The horizontal line, which is equal to 0.95, serves only as a reference to appreciate the change in the y-axis range and it is in all three panels.