AP diameter of 9mm in the midline means the front-to-back distance in the middle of the structure is less than a half inch.
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It could mean a circle with a diameter of 12.5 mm
The circumference of a circle with a diameter of 13 mm is: 40.84 mm
The circumference of a circle that is 16 mm in diameter is 50.27 mm
The planet Mercury has a diameter of 4879.4 kilometers. Nonsense is the measure of its diameter in mm. But it is 4879400000 millimeters (4.8794 x 109 mm or about 5 billion mm).
and what does the 6 mm refer to? The diameter, presumably.