The orientation parameters of surrounding bones (Δα´, Δβ´, Δγ´). The parameters (Δα´, Δβ´, Δγ´) were the orientation parameters (Δα, Δβ, Δγ) of bones (C1–C4 and mandible) were transformed to the parameters in the standardized coordinate system. X axes define the parameters of each bone segment. Y axes define the rotation of surrounding bones in the standardized coordinate system. Patients 1–6 correspond to graphs (a)–(f) in Figures 4, 5, 6. Values are in degree.