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Strong contraction to the unstable manifold of the eStance critical point suggests that the periodic orbit resulting from the Melnikov calculation is unique. The eStance limb nullclines are shown in red and the unstable eigenvector with a black dotted line. A set of eStance initial conditions on the q-axis quickly converge toward the unstable eigenvector of the critical point located where the v-nullcline intersects the q-axis.
