We wish to thank the anonymous reviewers for their insight and constructive comments, which greatly improved the paper. Daryl Herzman is gratefully acknowledged for computer support. This research was supported by Iowa Agriculture and Home Economics Experiment Station project 3806, under Hatch Act and State of Iowa funds. The authors wish to acknowledge use of the Ferret program for analysis and graphics in this paper. Ferret is a product of NOAA’s Pacific Marine Environmental Laboratory. (Additional information is available at http://ferret.pmel.noaa.gov/Ferret/.)
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