Fig. (2) Anthropometric landmarks used in the registration process for superimposing one image onto another. (a) right endocanthion b) left endocanthion (c) right exocanthion (d) left exocanthion (e) nasion (f) subnasale (g) right Alare (h) left alare (i) right chelion (j) left chelion (k) labial superioris (l) pronasale.