Figure 6: Illustration of pseudo potential landscape.
From: A geometrical approach to control and controllability of nonlinear dynamical networks
‘Pseudo’ potential 
of the two-node GRN system (a) for a1=1.0 (Δd≈0.3549), σ=0.05 and (b) for a1=1.3 (Δd≈0.0549), σ=0.05. Regions of warm and cold colours indicate the states with large and small pseudo energies, respectively. (c) For fixed σ=0.02, two-dimensional representation of 
for a number of values of a1. (d) For fixed a1=1.3, two-dimensional representation of 
for a number of values of σ.
