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The following HTML text is provided to enhance online readability. Many aspects of typography translate only awkwardly to HTML. Please use the page image as the authoritative form to ensure accuracy. THE NATIONAL ACADEMIES PRESS This paper was supported by Contract/Grant No. NASW-99037 between the National Academy of Sciences and NASA, and Contract/Grant No. 50SBNB0C2025 between the National Academy of Sciences and NIST. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author and do not necessarily reflect the views of the organizations or agencies that provided support for the project. International Standard Book Number 0-309-08856-9 Additional copies of this report are available from the Copyright 2003 by the National Academy of Sciences. All rights reserved. Printed in the United States of America
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