Fig. 6.

Trajectories and layer sizes for highly anisotropic growth law with admissible homeostatic state. a Contours for ${\dot{\gamma }}_1=0$ and ${\dot{\gamma }}_2=0$ for the system 6. As can be confirmed from the stream plots b, c, there is one stable spiral, two saddles, and one stable node. The saddle point P4 in (b) is the homeostatic equilibrium $\left({\gamma }_1^{\ast },,,{\gamma }_2^{\ast }\right)$. Parameters: $\mu =2$, $\Delta =\sqrt{3}$ ($A_0=1$, $A_2=\sqrt{7}$). $\tilde{K}=23.5$. Homeostatic growth: ${\gamma }_1^{\ast }=5.867$, ${\gamma }_2^{\ast }=3$