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Figure 4 Sequence of activation maps during the six consecutive 100 ms windows just before termination of transient AF after ablation in the same episode (dog 1) as shown in Figure 2. The black area in BB indicates a linear lesion created by radiofrequency catheter ablation. Note the absence of reentrant circuits of short cycle length in any window. The black line with arrows indicates the meandering course of activation along the atrial free wall. The right atrium was primarily activated by the wave fronts from the left atrium via the intercaval region. See text for discussion.