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Figure 2 Example of 7-day electrocardiogram recordings in a patient who underwent placement of circular plus linear left atrial lesions for treatment of atrial fibrillation (AF) before ablation as well as 3 and 6 months after ablation. In this case, the paroxysms of AF were easily recognized on the seven-day frequency profile by the abrupt occurrence of tachyarrhythmia. HR = heart rate.