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 any agency
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 notinfringe privately owned rights. Reference herein to any specific com-

mercial 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

ca

4

a“

c
2

ari

NTISprice codes:
Printed Copy: A08; Microfiche Copy: A01

Select target paragraph3