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Cephalometric measurements. (1) FMA angle. (2) CoA (midface length). (3) CoGn (effective mandibular length). (4) U1-FH (upper incisor inclination). (5) IMPA (lower incisor inclination). (6) U1-Na Perp (upper incisor tip to a line drawn perpendicular to Frankfort horizontal from nasion). (7) L1-Na Perp (lower incisor tip to a line drawn perpendicular to Frankfort horizontal from nasion).
