In this paper the object field, in any coordinate system, is always denoted by ƒ, and its projection by Φ, i.e., ƒ(x,y,z) and ƒ(r,ø,z) denote the same field.
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The value of a three-dimensional field at a single point can be determined in terms of the integrals of ƒ over all planes passing through the point. This is clear from the discussions of the Radon transform in Refs. 7, 9, and 10.
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