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. Author manuscript; available in PMC: 2016 Feb 8.
Published in final edited form as: J Biomech. 2013 Jan 12;46(4):828–831. doi: 10.1016/j.jbiomech.2012.12.008

Figure 2.

Figure 2

Effect of odd harmonic components on sinusoidal summations. When compared to the regular patterns of the 2nd (black solid line; sin(2·2π)) and the 3rd harmonics (gray solid line; sin(3·2π)), the summation of the 2nd and 3rd (dashed line; sin(2·2π) + 0.4sin(3·2π)) demonstrates changes in both timing and magnitude between steps. The 3rd harmonic constructively combines with the positive peak of the 2nd harmonic in the first step and destructively in the second, generating the magnitude differences in the summation highlighted by the gray regions. The constructive/destructive summation also induces a timing shift in the peaks as indicated by the timing of dashed vertical lines from the start of each step and as compared to the consistent solid vertical lines of the 2nd harmonic.