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. 2015 Mar 24;10(3):e0118623. doi: 10.1371/journal.pone.0118623

Fig 3. The parameter conditions for the pacing of the system.

Fig 3

The parameters G ss and G sa, which determine the pacing ability, are used to construct the parameter plane. G s,as = 5 nS for all ASs if they exist. Notations PND, PD and NP denote the SAN behaviors. A: The situation without an AS. When either G ss is small or G sa is small, impulse propagation fails (see the gray regions labeled “PND”). The inset is a magnification of the dashed squared frame. If G ss is very large, the pacing of the SAN fails (see the black region labeled “NP”). B: A single AS (11–32) is added to the system. C: Two ASs (11–32) and (23–34) are added. D: Four ASs (17–32), (20–34), (23,36) and (26,38) are added. In all cases with AS(s), the PND regions are completely eliminated.