The authors gratefully acknowledge the encouragement by Dave Gutzler, Vernon Kousky, Wayne Higgins, Kingtse Mo, and Jae Schemm. The authors wish to thank Diane Stokes and Minguye Chen for their help in extracting and processing observational data. We also greatly appreciate the comments and suggestions by John E. Janowiak, Richard W. Reynolds, Thomas M. Smith, Xiangqian Wu, and Eileen Maturi.
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