soe - ea ae . a -- ‘ oan EE: Jf : ho- Lee DISCLAMMER:+ 1°: This report was prepared as an account of work sponeored by an agency of the United States Government. Neither the United States Government nor any agency thereof, net any of ther employees. nor eny of ther contractors. subcontractors. or their employees. makes any warranty, express of implied. or assumes any iegal liability or responsibility for the accuracy, completenese. or usefulness of any-informauon. apparatus, product. or procesa disclosed. or represents that ite use would not infrings privately owned nghts. Reference herein to any speafie commernal product, process. or service by trade name. trademark. manufacturer. or otherwise. does not necessaniy constitute or imply ite endorsement. recommendation. or favoring by the United States Government of any agency. contractor of subcontractor thereof. The views and opumons of authors expreseed herein do not neceseaniy state or reflect those of the United States Government or any agency, contractor or subcontractor therecf. Printed in the United States of America Available from National Technical Information Service U.S. Department of Commerce 5285 Port Roya! Read Springfield. VA 22161 NTIS price codes: Printed Copy: A04: Microfiche Copy: AOl 9008 14S