Figure 3.

A surface plot of the effective potential $W=1/u$ (a) and the landscape function u (b). In (a) we plot the boundaries of the sets $\{x:\epsilon u(x)\ge 1\}$ that localize the eigenstates. In (b) we plot the circles of radius $1/\widetilde{{\epsilon }_i}$, for ${\tilde{\epsilon }}_{i-1}=3W_{\min ,i}/2$, $i=1,2,3$, centered at the i-th lowermost local minimum $W_{\min ,i}$.