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Figure 5 A schema showing the relationship between the electrogram pattern obtained at each site and recurrent conduction site. Sites 1, 2, 4, and 5 are activated by the wave front originating from the recurrent conduction site, resulting in mainly negative (site 1 and 2) and positive deflection (site 4 and 5). Site 3 is activated by the wave front perpendicular to the bipole, resulting in the transitional electrogram. Abbreviations as in Figure 1.