Cactus Code Thorn Extract
Thorn Author(s)     : Gabrielle Allen	
Thorn Maintainer(s) : The Cactus Team <cactusmaint@cactuscode.org>
CVS info   : $Header$
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Purpose of the thorn:

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.