To the left, three sensors attached to the hallux, navicular bone, and calcaneus are depicted by the smaller coordinate axes. The data window displays a graph of the Euler rotation about the Y axis of the hallux. It is being displayed in the reference frame of the navicular bone and represents flexion of the hallux relative to the mid-foot.

To the left, a similar display is depicted for the hand detail. Here the third proximal phalanx is being tracked relative to the third metacarpal. Flexion of the third proximal phalanx relative to the third metacarpal is displayed in the data window on the left.