| Frankfort Horizontal (FH) |
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| 1) A plane passing through three points of the right and left
porion and the left orbitale. |
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| 2) First proposed at the
Craniometric Congress held in Munich, Germany, 1877. |
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| 3)
An orientation of skull in a consistent and reproducible position. |
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| 4) Comparisons: natural head position; horizontal visual axis;
and horizontal plane. |
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