I forgot to attach the promised Oak Ridge National Labs (ORNL) file to the preceding post, and now I find that the system won't let me attach it thereto. It won't even let me attach it hereto either! It's probably the size of the file, even though it's well under the stated 10 Mbyte limit for PDF attachments. (I've had this problem frequently on this site.) So, the best I can do is point you to the URL where it can be downloaded:
http://www.osti.gov/bridge/purl.cove...922327-5ktfCi/

Stan