$Y_{\mathrm{\mu \epsilon \gamma }}=100\left(\frac{{\rho }_w-{\rho }_0}{{\rho }_w+{\rho }_0}\right)+6.2=100\frac{1.5-{\rho }_0}{1.5+{\rho }_0}+6.2=100(\frac{1}{{\rho }_0}+30)-\mathrm{0,67}$