DISCLAIMER
This report was prepared as an account of work sponsored by an agency of the United
States Government. Neither the United States Government nor anyagency thereof,
nor any of their employees, nor any of their contractors, subcontractors, or their
employees, makes any warranty, express or implied, or assumes any legal liability or
responsibility for the accuracy, completeness, or usefulness of any information,

apparatus, product, or process disclosed, or represents that its use would not intringe
privately owned rights. Reference herein to any Specific commercial product, process,
or service by trade name, trademark, manufacturer, or otherwise, does not necessarily
constitute orimply 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 necessanilystate 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 Roval Road
Springfield, VA 22161
NTIS pnice codes:

Printed Copy: A04; Microfiche Copv: AOl

Select target paragraph3