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Landmarks in (a) axial, (b) sagittal, and (c) coronal slices. ABW, alar base width; ANS, anterior nasal spine; AW indicates alar width; N', nasion soft tissue; Pas, superior pyriform aperture; Pai, inferior pyriform aperture; Pal, left pyriform aperture; Par, right pyriform aperture; PNS, posterior nasal spine; Prn, pronasale; Sn, subnasale.
