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Figure 3 Anatomic location of the origin of the arrhythmia, with corresponding 12-lead electrocardiographic morphology. Note the different morphology in leads V₁ and V₂ with respect to the anatomic origin. L = left coronary aortic sinus; N = noncoronary aortic sinus; R = right coronary aortic sinus; RVOT = right ventricular outflow tract.