Theoretical predictions of (a) the radius‐density relation, (b) the radius‐temperature relation, and (c) the density‐temperature relation when ﹩\gamma =1﹩. Solid line: ﹩\Omega _{0}=0.2﹩ and ﹩M_{\mathrm{vir}\,,0}=5\times 10^{15}\,M_{\odot }﹩. Dotted line: ﹩\Omega _{0}=0.2﹩ and ﹩M_{\mathrm{vir}\,,0}=5\times 10^{14}\,M_{\odot }﹩. Dashed line: ﹩\Omega _{0}=1.0﹩ and ﹩M_{\mathrm{vir}\,,0}=5\times 10^{15}\,M_{\odot }﹩. Dash‐dotted line: ﹩\Omega _{0}=1.0﹩ and ﹩M_{\mathrm{vir}\,,0}=5\times 10^{14}\,M_{\odot }﹩. Open diamonds, triangles, and circles correspond to the collapse redshifts of ﹩z_{\mathrm{coll}\,}=0﹩, 0.5, and 4, respectively. We assume that ﹩r_{\mathrm{vir}\,}=8r_{c}﹩. The observational data obtained by Mohr et al. (1999; filled circles) and Peres et al. (1998; open squares, only seen in panel b) are overlaid.