1:36 PM, Wednesday December 28th 2022
so the center line is basically a long axis which goes through all the 2d planes.
here i tried to explain it.
with the sphere i tried to explain the minor axis of each ellipse they are called
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coronal blue
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transverse green
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sagittal pink
you can search up as the anatomical plane diagrams.
imagine like if you were chopping the sphere front to back you would follow the blue axis so every ellipse's minor axis will be the same with the blue axis
lastly as you can see blue axis is passing through from the intersection of the pink and green ellipses and its the same for the other 2 ellipses es well.
I hope it helps let me know if you have any questions!