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. 2019 Mar 27;7(3):e12284. doi: 10.2196/12284

Figure 2.

Figure 2

A snapshot of a synchronized photoplethysmography signal and single-lead electrocardiogram in patient with sinus rhythm (left) and atrial fibrillation (right). The red dots indicate a detected heart beat. ECG: electrocardiogram; PPG: photoplethysmography.