Determination of the 25 head-feature points. 1, Vertex; 2, metopion; 3, right superciliare; 4, sellion; 5, right nasal root point; 6, right pupil; 7, right temple; 8, right endocanthus; 9, right ectocanthion; 10, right infraorbitale; 11, right lateral zygomatic; 12, pronasale; 13, right alare; 14, subnasale; 15, labiale superius; 16, right cheillion; 17, stomion; 18, labiale inferius; 19, sublabiale; 20, chin; 21, menton; 22, right otobasion superiuss; 23, right postaurale; 24, right tragion; 25, midpoint of rear hairline.