Tox,ratio=1TOXG2⋅(TOXREFTOXG)NTOXi(3.511) T_{ox,ratio} = \dfrac{1}{TOXG^2} \cdot \Bigg( \dfrac{TOXREF}{TOXG} \Bigg)^{NTOX_i} \qquad (3.511) Tox,ratio=TOXG21⋅(TOXGTOXREF)NTOXi(3.511)