Figure 8. Snapshot of the infected population.

The model indicates that there is increasing volatility in the recovery population after 240 days due to the outgoing moves from the recovery population to the natural death population (Figure 8A). The spread of the disease in the discrete transform peaked at 240 days (Figure 8B) and at 230, 250 and 340 days due to large coefficients (Figure 8C). The range of frequencies used in averaging is indicated by the arrow at 250 and 362 days, which correspond to the peaks of the disease spread (Figure 8C).