The gcompare program determines compares two lists of objects with X,Y
coordinates and prints the matched entries. A radius of matched is
given, and all pairs of objects between the two lists which lie within
the given radius are printed. The delta coordinates may also be
optionally printer, or the unmatched objects in either the first or
second list. An offset for the center can be optionally applied.
gcompare file1 Nx Ny file2 Nx Ny radius [options]
-c x y