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. 2013 Apr 9;8(4):e60962. doi: 10.1371/journal.pone.0060962

Figure 2. Reference plane for measurement.

Figure 2

A. Front view of reference plane; B. Skull base view of reference plane, and three points were identified to ensure the reference plane: a, midpoint of the left greater palatine foramen; b, midpoint of the right greater palatine foramen; c, the forefront of the nasal crest.