DISCLAIMER
This report was prepared as an account of work sponsored by an agencyof the United
States Government. Neither the United States Government nor any agency thereof,
nor any of their employees, nor any of their contractors, subcontractors, or their

employees, makes any warranty, express or implied, or assumesany legalliability or
responsibility for the accuracy, completeness, or usefulness of any information,
apparatus, product, or process disclosed, or represents that its use would not infringe
privately owned rights. Reference herein to any specific commercial product, process,
or service by trade name, trademark, manufacturer, or otherwise, does not necessarily
constitute or imply its endorsement, recommendation, or favoring by the United States

Government or any agency, contractor or subcontractor thereof. The views and
opinions of authors expressed herein do not necessarily state or reflect those of the

United States Government or any agency, contractor or subcontractor thereof.

Printed in the United States of America
Available from
National Technical Information Service
U.S. Department of Commerce
5285 Port Royal Road
Springfield, VA 22161
NTIS price codes:
Printed Copy: A04; Microfiche Copy: A01

Select target paragraph3