Table 27.

The fitting mean errors, standard deviations, and coefficient of determination from the three models in Case 9.

Index	Fick Model	Exponential Model	Mixed-Curve Model
Fitting mean error $\overline{\delta }$	0.3607	0.0954	0.0824
Fitted standard deviation $\sigma$	0.7818	0.2164	0.1692
Coefficient of determination ($R^2$)	0.9850	0.9989	0.9993