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.
The exterior component is an apple surface and the
interior component is a lemon surface. The above
left figure shows a spindle torus, the middle a cutaway, and the right figure shows
a cross section of the spindle torus through the
-plane. The inversion
of a spindle torus is a spindle cyclide (or parabolic spindle cyclide).
and enclosed volume 
satisfy
(Verrall et al. 2026, p. 174). Here, 
is the radius of the generating
circle and 
is the distance of its center from the rotation axis.
