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Figure 5 (A) Peak area ratio (three-axis mean) to varying envelope widths show that peak area ratios fall as envelopes widen from 0.625 to 5 Hz, although differences between AF and AFL were maintained (Table 2). Small icons represent individual patients and large icons represent the mean (± SD) for each group. (B) Receiver operating characteristic (ROC) curves for the diagnosis of AFL at each envelope width. The arrow indicates the optimum envelope width (2.5 Hz; Fig. 6). Other abbreviations as in Figures 1 and 2.
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