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of sites in the CHICOS array and coordinated among hundreds of teachers and school administrators to keep the array running. The data-acquisition software was designed and implemented by Sandy Horton-Smith and Juncai Gao. Chao Zhang contributed critical parts of the original data-filtering software and a set of diagnostic tools for determining the health of sites in the field. The CHICOS project owes much to Brant Carlson and Chris Jillings for the original development of the shower-reconstruction software. We thank Pat Huber, who has performed the essential task of maintaining the CHICOS server and has also overseen the deployment and maintenance of the CHICOS computers in the field. Many thanks are also given to Bob Gates, who has been crucial in running the CHICOS summer program for high school students. CHICOS has benefitted from the work of summer students Stephen Ho, Keith Chan, Derek Wells, Shawn Ligocki, and Veronica Anderson in developing a CHICOSspecific lateral distribution function and time distribution function. We also wish to acknowledge students Angela Marotta, for her work on the temperature variation of
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E. Brobeck (2009) studied this question.