Cactus Code Thorn Extract
Author(s)    : Gabrielle Allen	
Maintainer(s): Cactus team
Licence      : LGPL
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1. Purpose

Calculate gauge invariant waveforms, using the Moncrief formalism,
for cases when the spacetime approximates spherical symmetry.

Calculate other quantities on a surface, such as ADM mass, momenta,
and spins.