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Figure 1.

Example of a PCG of one cardiac cycle. The amplitude of S1 was saturated to optimize the amplitude range of S2. The 18th-order Coiflet wavelet used in our study is presented for visual comparison with A2 and P2.

Med Biol Eng Comput. 2002 March; 40(2): 205–12.
doi: 10.1007/BF02348126.