Fig. 2.

Data versus model fitting: (a) data fitting versus model, (b) prediction of the model for large time level, (c) simulation of the model using stochastic model with ${\sigma }_1=0.0002$, ${\sigma }_2=0.002$, ${\sigma }_3=0.02$, ${\sigma }_4=0.02$, ${\sigma }_5=0.002$ and ${\sigma }_6=0.002$.