Fig. 3

Attracting slow manifold \(S^{a}_{\varepsilon }\) (red surface) and saddle slow manifold \(S^{s}_{\varepsilon }\) (green surface), projected onto \((x,y,z)\)-space, for system (11) with \(\mu =9.2\) and \(\varepsilon =0.01\). The gray line is the fold curve F of the critical manifold. These surfaces were rendered from the orbit segments shown; compare with Fig. 2