(a) Plot of ﹩\mathrm{log}\,B_{\mathrm{los}\,}﹩ vs. ﹩\mathrm{log}\,n﹩ from the C99 data set. The solid line is the best fit (see text). The correlation coefficient is 0.84. (b) Plot of ﹩\mathrm{log}\,B_{\mathrm{los}\,}﹩ vs. ﹩\mathrm{log}\,\sigma _{v}n^{1/ 2}﹩ for the same data. The correlation coefficient is 0.95. The solid line is the best fit, and the dashed line is a theoretical relation (eq. [3] for ﹩\sqrt{c_{1}}/ \mu =1﹩).