Shells 
Variation of parameter (7)
7. Angle of ellipse rotation around the horizontal line orthogonal to the plane of the ellipse: \(\phi\)
7. Angle of ellipse rotation around the horizontal line orthogonal to the plane of the ellipse: \(\phi\)
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Created on: 2007
Last update: 2021-02-26 09:10:30+0000
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