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Cephalometric landmarks and reference lines. s (sella), the midpoint of the cavity of sella turcica; n (nasion), the anterior point of the intersection between the nasal and frontal bones; ago (anterior gonion), the most inferior point of the gonion;gn (gnathion), the most inferior point of the mandibular symphysis; ML (mandibular line), tangent to the inferior border of the mandible, from gn to ago; NSL (nasion-sella line), the anterior skull basis, from n to s.
