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Figure 2 Representative example of the sequence of activation maps during 12 consecutive 100 ms windows (total of 1.2 s of analysis) from an episode (dog 1) of atrial fibrillation. The colored lines indicate the location of unstable reentrant circuits. The gray arrows indicate the activation wave fronts that are not part of a reentrant circuit. Thin lines represent isochrones at 10 ms intervals. The thick dashed lines represent lines of functional block. The asterisk indicates the epicardial breakthrough point of the wave front coming from the septum. The dark gray regions indicate the atrial areas that were not activated during a 100 ms window. BB = Bachmann’s bundle area; CS = coronary sinus; IVC = inferior vena cava; LAA = left atrial appendage; PV = pulmonary vein; RAA = right atrial appendage; SVC = superior vena cava. See text for discussion.