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Filtering by: Funding statement This material is based on work supported by the U.S. National Science Foundation (NSF) under grants 03-26064, 04- 47287, and EAR 04-09534 and by the UK Natural Environment Research Council (NERC) LOCAR program under grant NER/T/S/2001/00948. Remove constraint Funding statement: This material is based on work supported by the U.S. National Science Foundation (NSF) under grants 03-26064, 04- 47287, and EAR 04-09534 and by the UK Natural Environment Research Council (NERC) LOCAR program under grant NER/T/S/2001/00948.

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