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Figure 3: Wavelet decomposition process of PPG signal by using sym8 wavelet at 6 levels. (a) 10-second measured signal of PPG (ppg10s), (b) level 1 details, (c) level 2 details, (d) level 3 details, (e) level 4 details, (f) level 5 details, (g) level 6 details, (h) level 6 approximation, and (i) the corrected signal.