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Distance between bilateral landmarks: (a) maxillary first molar central pits, (b) palatal alveolar crests, (c) greater palatine foramena, (d) nasal width, (e) inferior margin zygomaticomaxillary suture, (f) infraorbital foramena, (g) superior margin zygomaticomaxillary suture, (h) the anterior border frontozygomatic suture, (i) and the lateral border frontomaxillary suture.
