The authors extend their appreciation to Dr. Jim Dodge of NASA Headquarters and to Mr. Michael Goodman of NASA/Marshall Space Flight Center for developing the WetNet project, which supports the PIPs, and to Mr. Jim Merritt of the Florida State University (FSU) for his assistance with computer graphics. Research support at FSU was provided by NASA Grants NAGW-3970 and NAG5-2672; essential travel support was provided by NATO Grant CG-890894.
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