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ECG detected by commercial three leads ECG device in (a) Example 1 and (b) Example 2. (c) Heartbeats detected by the PVDF sensor corresponding to Example 1 in (a). (d) ECG signal detected by the conductive fabric sensor corresponding to Example 2 in (b); (e) and (f) show the true peaks expressed by solid lines and misdetections expressed by dotted lines, and the missed peaks marked by circles corresponding to (c) and (d) respectively. Nu expresses normalized units.
