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Demonstration of dicrotic notch detection for different age groups: Case 1 (26 years), 2 (45 years), and 3 (80 years). (a) Filtered PPG signal where we draw a line from systolic peak to diastolic peak; (b) subtract the line from the signal and find its minimum point; (c) initial notch detected; (d) adjust the notch using the fix index.
