Table 3.

The fitting mean errors, standard deviations, and coefficient of determination from the three models in Case 1.

Index	Fick Model	Exponential Model	Mixed-Curve Model
Fitting mean error $\overline{\delta }$	0.8007	0.8130	0.3313
Fitted standard deviation $\sigma$	1.4056	1.3674	0.6854
Coefficient of determination ($R^2$)	0.9692	0.9709	0.9927