The work reported here was done over more than 15 years with many interruptions. Until his passing in November 1995, Vern Plank was part of this collaboration to design and improve his M-meter. Analyses, interpretations, and presentations of data and conclusions given here are solely those of the present authors. We gratefully acknowledge support and assistance from: Arnold Barnes, Morton Glass, and Dennis LaGross of the Phillips Laboratory (now U.S. Air Force Research Laboratory) at Hanscom AFB; Paul Lawson, then affiliated with the Colorado International Corporation and now with SPEC, Inc.; Darrel Baumgardner and the NCAR Research Aviation Facility; and Ken Hartman and Connie Crandall of the South Dakota School of Mines and Technology. The first author acknowledges partial support from cooperative agreements ATM-8620145, ATM-9104474, ATM-9401117, and ATM-9618569 between the National Science Foundation and the South Dakota School of Mines and Technology, and from a summer faculty research program at the Phillips Laboratory sponsored by the Air Force Office of Scientific Research.
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