Fig. 6.

Left panels: daily number of deaths (green circles) attributed to COVID-19 for a Brazil and c Bulgaria, up to March 3, 2022. The solid curves are the best fits by the pathway model with three waves ($N=3$). The black dots indicate the maxima and minima of the daily theoretical curve that correspond to the peak and starting dates of the main waves. Right panels: Cumulative number of deaths for the same countries as in the corresponding left panels, where the empirical data are indicated by green circles and the solid curve represents the curves obtained by numerically integrating the theoretical curves in the left panels