Figure 11.

Cell propagation morphology in cartesian coordinates (left) and polar coordinates (right). Time-dependent cell vertices $\overrightarrow{C}(x,y,t)$ (black dots) and their spatial density distribution (blue). The vectors ${\zeta }_1$ and ${\zeta }_2$ are the independent basis vectors used to characterize the eccentricity of the spatial density distribution of $\overrightarrow{C}(x,y,t)$.