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Reference landmarks description.
| Landmark | Description |
|---|---|
| ANS | Anterior nasal spine |
| U1 | The most mesial point of the tip of the crown in between the upper central incisors. |
| U6l | The most inferior point of the mesial buccal cusp of the crown of the left upper molar. |
| U6R | The most inferior point of the mesial buccal cusp of the crown of the right upper molar. |
