The original ancestor of this document was by Chin Fang <fangchin@leland.stanford.edu>.
Eric S. Raymond <esr@snark.thyrsus.com> reworked, reorganized, and massively rewrote Chin Fang's original in an attempt to understand it. In the process, he merged in most of a different how-to by Bob Crosson <crosson@cam.nist.gov>.
The material on interlaced modes is largely by David Kastrup <dak@pool.informatik.rwth-aachen.de>
Martin Lottermoser <Martin.Lottermoser@mch.sni.de> contributed
the idea of using gnuplot to make mode diagrams and did the
mathematical analysis behind modeplot. The distributed
modeplot was redesigned and generalized by ESR from
Martin's original gnuplot code for one case.