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. Author manuscript; available in PMC: 2012 Dec 1.
Published in final edited form as: Ann Biomed Eng. 2011 Sep 10;39(12):2900–2910. doi: 10.1007/s10439-011-0391-5

FIGURE 2.

FIGURE 2

Modes of motion. ξ1 = swing front to back, ξ2 = swing side to side, ξ3 = rotation along the long axis of the heart, and ξ4 = translation along the z-axis.