Extensive rewriting was done in some sections.  All suggested changes
were incorporated (including the addition and replacement of several
figures), with he following exceptions:

Ref B:

F. The rep is described in the proton driver section; it is not simply
quantified as a single frequency.

Ref C:

Discussing dispersion and chromaticity in a skew lattice is more
detailed than is appropriate for this paper.

Discussion of the details of analyzing TPC tracks in this context is
beyond the scope of this paper.

We have chosen to continue to use "we."  The use of "we" is accepted
(in fact somewhat encouraged) in the AIP style manual.