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Supporting Online MaterialThis supplement contains:
Materials and Methods
Tables S1 to S7. Excel and PDF tables (packaged as compressed archive, in *.zip format; users should download the compressed file to their machine and decompress the file on their local hard drive, using the instructions below). Instructions for downloading and decompressing files:
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Science. ISSN 0036-8075 (print), 1095-9203 (online)