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Figure 2 Electroanatomic bipolar voltage map of Patient #4 performed during sinus rhythm. The voltage map delineates the region of scar border-zone. Note that the premature beats originating from the Purkinje network are in this border-zone, where successful ablation was performed (brown tags). Purple tags represent sites recording Purkinje potentials in sinus rhythm, and white tags represent fractionated complex electrograms.