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Figure 6 (A) Optimum peak area ratio (envelope width 2.5 Hz) separated all AFL from AF patients using cutpoint  0.44 (three-axis mean). (B) Receiver operating characteristic (ROC) area under the curve was, thus, better for 2.5 Hz (area = 1) than other envelopes. (C) Between spatial axes, 2.5-Hz peak area ratios varied for each patient but not consistently for either group (Table 2). Other abbreviations as in Figures 1 and 2.
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