$//<![CDATA[ \begin{array}{l}\displaystyle \mu_{ob}(R_s) = A \cdot \left( \mu_{od} \right)^B\end{array} //]]>$,  $//<![CDATA[ \begin{array}{l}A = \right[ 1 + \left( R_s/{c_1} \right)^{c_2} } \right]^{-1}\end{array} //]]>$, $//<![CDATA[ \begin{array}{l}B = c_3 + (1-c_3)\, \cdot \right[ 1 + \left( R_s/{c_4} \right)^{c_5} } \right]^{-1}\end{array} //]]>$

$//<![CDATA[ \begin{array}{l}c_1 = 344.198, \ c_2 = 0.855344, \ c_3 = 0.382323, \ c_4 = 567.953, \ c_5 = 0.819326\end{array} //]]>$