In Eqs. ( )-( ), the parameters 𝑟 V , 𝑏 V (𝑙 = 1, 2, 3), Da 345 , Py 7 , and 𝜑 are now continuous functions of 𝑇 1 (𝜏). Thus, the SAS in continuous variables is expressed by a system of coupled implicit integral equations. In Appendix B, it is shown that SAS in continuous variables satisfies the model equations and, therefore, is an exact representation of the model.