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Bifurcation diagram for four heterogeneous neurons. Two isolas in the bifurcation diagram for the same four heterogeneous neurons as in Fig. 5. Each of the isolas corresponds to the splits of 
and 
. Stable branches are represented by solid (blue) lines, while the unstable ones are represented by dotted (black) lines. Filled (red) stars and filled (red) circles denote the period-doubling and the fold bifurcation points, respectively
