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Supplementary MaterialSupplemental material. Web presentation including:
clark_supp.zip (640 KB) [Compressed archive of HTML file and accompanying documents, in *.zip format; users should download the archive to their machine and decompress the files on their local hard drive, using the instructions below.] Instructions for downloading and extracting supporting data files:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)