This bone has two 3D pieces referred to as the Centrum and the Neural Spine. Shortly after the 3D photogrammetry was done, the two were epoxied together. Only the top part of the neural spine was detached, so this Muffin's first vertebra in prep order with the neural spine now fused to the centrum. This is an ontogenietic age related clue for the dinosaur. Technically, this is Caudal Vertebra 4. It is a coincidence that the numbers are the same.
The 3D models and still .jpg measurement photos for this fossil can be accessed from Zenodo:
The Centrum: https://zenodo.org/uploads/13261214
The Neural Spine: https://zenodo.org/uploads/13261210