Table 1. Landmark definitions.

Glabella	The midpoint of the most prominent ridge between eye brows.
Nasion	Midpoint on the soft tissue contour of the base of the nasal root at the level of the frontonasal suture.
Exocanthion*	Soft tissue point located at the outer commissure of each eye fissure.
Endocanthion*	Soft tissue point located at the inner commissure of each eye fissure.
Alar base*	The base of the nostril.
Pronasale	The most protruded point of the apex nose identified in a lateral view of the rest position of the head.
Subnasale	Midpoint on the nasolabial soft tissue contour between the columella crest and the upper lip.
Cheilion*	Point located at each labial commissure.
Crista Philtre*	Point at each crossing of the vermillion line and the elevated margin of the philtrum.
Labrale Superius	Midpoint of the vermillion line of the upper lip.
Inferior Labrale Superius	A landmark on the upper lip located midway between Labrale Superius and Stomion Superius.
Labiale Inferius	Midpoint of the vermillion line of the lower lip.
Pogonion	Most anterior mid-point of the chin.
Midpoint between the crista philtre and Cheilion on the upper lip*	A landmark on the upper lip located midway between the Crista Philtre and Cheilion.
Midpoint Labiale Inferius and Cheilion on the lower lip*	A landmark on the lower lip located midway between Labiale Inferius and Cheilion.
Tragus*	A landmark on the midpoint of medial margin of the facial insertion of the tragus.

* bilateral left and right landmarks