Cactus Code Thorn CarpetRegrid2
Author(s)    : Erik Schnetter <schnetter@cct.lsu.edu>
Maintainer(s): Erik Schnetter <schnetter@cct.lsu.edu>
Licence      : GPLv2+
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1. Purpose

Set up refined regions by specifying a set of centres and radii about
them.  The refined regions are then the conjunction of these regions.