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Fig. 1. Measured axes and angles in the pitch plane. Head axis was a line passing
through the external auditory meatus and the apex of the prognathous mouth.
Trunk axis was a line passing through the hip and shoulder joints. Head angle
relative to space (
) and trunk angle relative to space (ß) were
measured in reference to earth horizontal. Head-to-trunk angle (
) was
calculated from the head-to-space and trunk-to-space angles.