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. 2013 Dec 27;14(1):443–457. doi: 10.3390/s140100443

Figure 4.

Figure 4.

Illustration of the heel (black line) and toe (light gray line) trajectories during swing phase and corresponding clearance parameters. IMU location relative to the heel and toe can be determined with the three parameters a, b, c. Besides, θY shows the heel pitch angle during the stance phase.