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Visualization of adaptive signal level threshold determination: (a) whole 10-k sample PPG signal with determined LpMAX, LpMIN levels, HPAMPL and heart ripple parameters, and finally calculated LADAPT level, (b) ROI within 80th–89th PPG cycles with localized systolic peaks, determined LpMAX/LpMIN values, and global LOFS value; fs = 100 Hz.
