Fig. 8.

The 3D MDS locus of the 79 countries using the item-to-item dissimilarities in the frequency-domain $d_{C_{\mathit{ij}}}^{f,X}$ during the period $\tau$. The size of the dots is proportional to the logarithm of the number of infections and the color is proportional to the time elapsed since the first reported case in each country up to T