Fig. 18

Ribbons of the extended attracting slow manifold in the Hodgkin–Huxley model (32) with \(\varepsilon =0.0083\) and \(I=9.74\). Panel (a) shows five ribbons \(R_{4}\)–\(R_{8}\) of the extended attracting slow manifold in five different colors, together with the associated canard orbits (thick curves); the inset is an enlargement. Panel (b) shows the ribbon \(R_{6}\) with the bounding twin canard orbits \(\xi _{6}\) and \(\xi '_{6}\) (thick curves); the inset is again an enlargement