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Figure 3 Computerized mapping of focal activations in a pulmonary vein (PV). (A) Bipolar electrograms. The electrode locations a–e are marked in panel B. The patterns of activation of beats B, C, and D in panel A are shown by isochronal maps in panels B, C, and D, respectively. The dotted line in panel B shows the junction between PV and left atrium (LA). Black arrows indicate the site of earliest activation in the PV. LIPV = left inferior pulmonary vein.