A coordinate system given by the coordinate transformation
(1)
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(2)
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(3)
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and defined for , , and . Surfaces of constant are given by the toroids
(4)
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surface of constant by the spheres tangent to the -plane
(5)
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and surfaces of constant by the half-planes
(6)
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The metric coefficients are
(7)
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(8)
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(9)
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