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A. Spatial organization index in XY plane (ECG: V5-aVF) is low and stable during AF over 30 minutes (left cluster); and elevates at incremental time points culminating in AT (red; right cluster). B. Spatial organization index (y-axis) for the group is summarized at time points culminating in AT. In both panels; X, Y, Z leads represent surface ECG leads V5, aVF and V1 respectively; X axis: time, Y axis: spatial organizational index.
