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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 mouth. Trunk axis was a line passing through the hip and shoulder joints. Head angle relative to space ({theta}) and trunk angle relative to space (ß) were measured in reference to earth horizontal. Head-to-trunk angle ({alpha}) was calculated from the head-to-space and trunk-to-space angles.





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