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. 2019 Sep 2;25:6574–6580. doi: 10.12659/MSM.917676

Figure 3.

Figure 3

The process of lifting wavelet transforms to extract harmonic components from sound pressure signal files. Annulus fibrosis (A), sub-endplate cortical bone (B), posterior longitudinal ligament (C), penetration (D), endplate cartilage (E).