Figure 4.

Four spectrograms from a single subject corresponding to the audio signals from two microphones over the right and left transverse processes of C1 during two separate C1-2 HVLA thrust manipulations (one targeting the left and the other targeting the right atlanto-axial articulation).

Dunning et al. BMC Musculoskeletal Disorders 2013 14:24   doi:10.1186/1471-2474-14-24
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