$//<![CDATA[ \begin{array}{l}\displaystyle \mu_{ob}(R_s) = A \cdot \left( \mu_{od} \right)^B\end{array} //]]>$,  $//<![CDATA[ \begin{array}{l}A = c_1 + c_2 \cdot 10^{\, c_3 \cdot R_s}\end{array} //]]>$, $//<![CDATA[ \begin{array}{l}B = c_4 + c_5 \cdot 10^{\, c_6 \cdot R_s}\end{array} //]]>$

$//<![CDATA[ \begin{array}{l}c_1 = 0.1651, \ c_2 = 0.6165, \ c_3 = -6.0866 \cdot 10^{-4}, \ c_4 = 0.5131 \ c_5 = 0.5109 , \ c_6 = - 1.1831 \cdot 10^{-3}\end{array} //]]>$