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re: sauropod necks

Hey, a have a question about this. I don't have this paper in front of me,
but one of the specimens they measured is a mounted skeleton. How the heck
did they get good zygapophyseal surface measurements? 


>The computer model essentially modeled these joints
>based off of 
>careful measurements of the zygapophyseal surfaces by Parrish >and Stevens
on Diplodocus and Apatosaurus specimens.

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