Our main interest is to investigate the effect of the parameters (given in Table 1) on the outcomes of the model after a number of iterations. However, the model outcomes may also be dependent on the values we have chosen for the constants of the model. For the region size and the number of iterations in the model, there is a trade-off between making sure that the values selected are large enough to give accurate and reproducible results, but not so large that computational costs are prohibitive.