Fig. 8From: Saddle Slow Manifolds and Canard Orbits in \(\mathbb{R}^{4}\) and Application to the Full Hodgkin–Huxley ModelCanard orbits \(\xi _{0}\)–\(\xi _{8}\) of system (11) with \(\mu =100.1\) and \(\varepsilon =0.01\). Panel (a) shows \(\xi _{0}\)–\(\xi _{8}\) in projection onto the (\(y,z\))-plane; and panel (b) is an enlargement. The insets show all computed canard orbits in projection onto the (\(x,z\))-plane and (\(w,z\))-plane, illustrating how close they are to the critical manifold SBack to article page