Coordinate system 
In Cartesian coordinates 
Tangent-Sphere 
Cardioid 
Bispherical 
Toroidal 
Inverse Prolate Spheroid
Inverse Oblate Spheroid
| Coordinate system | In Cartesian coordinates |
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| Tangent-Sphere |
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| Cardioid |
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| Bispherical |
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| Toroidal
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| Inverse Prolate Spheroid
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| Inverse Oblate Spheroid
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