This research was supported by NSF Grants ATM-9627890 and ATM-9616728. We are grateful to John Augustine for providing the automated satellite classification software and assisting with its implementation. We also thank Dr. Arlene Laing for useful discussions on MCCs. Reviews by Dr. Laing and two anonymous reviewers considerably aided the presentation and substance of this paper. This is Journal Paper J-17681 of the Iowa Agriculture and Home Economics Experiment Station, Ames, Iowa, Project No. 3245, and supported by Hatch Act and State of Iowa funds.
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