This research work was supported by NASA Grant NAG1-1719 and Air Force Geophysics Directorate Contract F19628-95-K-002. We thank B. Baum for providing satellite data and imageries, A. Heymsfield and L. Miloshevich for supplying replicator and 2D-probe data, and Y. Takano, P. Yang, and N. Rao for performing some of the calculations and graphing. Information on FIRE data summary was provided by K. Sassen.
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