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Figure 2 (A) An ECG of atypical AFL coded as atrial fibrillation (AF). Intracardiac tracings confirmed right atrial (RA) AFL. (B) Correlation-time series show regularity in "filtered atrial ECGs" (particularly V1). (C) Correlation spectra show dominant peaks at 4.04 Hz that are tall and narrow (area ratios = 0.51, 0.56, and 0.81 in X-, Y-, and Z-axes, respectively; 2.5-Hz bandwidth). Other abbreviations as in Figure 1.
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