This is a schematic drawing of the electron probability density distribution for an atom in the state: n=3, l=2, m=o. The central nucleus is not shown. We see an equatorial torus with detached "caps" equally spaced along the polar axes.
     This image is a schematic drawing of the basic morphology of the planetary nebula NGC 7026. There is a prominent toroid in the middle and detached cap-like structures equally spaced above and below the toroid.

Source: R. Eisberg and R. Resnick, Quantum Physics of Atoms, Molecules, Solids, Nuclei and Particles, 2nd ed., John Wiley and Sons, New York, 1985.
Source: J. Solf and R. Weinberger, Astronomy and Astrophysics, vol. 130, pg. 269, \ 1984 (Figure 8).


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