This research was supported by National Science Foundation Grants ATM-0444205 and ATM-0837870. SWH was supported by Fellowship PBEZ2-113920 from the Swiss National Science Foundation and Grant 52734-EV from the Army Research Office. We thank the Barringer Crater Company and Meteor Crater Enterprises for crater access and those listed in the acknowledgments section of Whiteman et al.’s (2008) article for their help with the field program. We thank S. Oncley, S. Semmer, T. W. Horst, and W. O. J. Brown for assistance with radiation instrumentation. Javier Corripio provided the computer code to compute topographic shading. We thank the three anonymous reviewers for their comments that helped to improve the manuscript.
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