On the complex bifurcation set for a system with simple dynamics

Bifurcations of a heteroclinic contour composed of two equilibrium points of saddle-focus type and two heteroclinic orbits are considered. The case is selected where dynamics of the system is simple, i.e., no more than one periodic orbit is born at bifurcations in a small neighborhood of the contour. In spite of the simplicity of dynamic behavior, the structure of the bifurcation set corresponding to multi-round heteroclinic orbits is shown to be rather complicated. The complete bifurcation analysis is done under some conditions of a general position.