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(a) PPG signal waveform at 660 nm for constant diastolic pressure of 60 mmHg and varying systolic peak pressure (65, 120, and 180 mmHg). (b) PPG signal waveform at 940 nm for constant diastolic pressure of 60 mmHg and varying systolic peak pressure (65, 120, and 180 mmHg). (c) %Mod for constant diastolic pressure of 60 mmHg and variable systolic pressure (65, 70, 80, 90, 100, 120, 140, 160, and 180 mmHg).
