[time-nuts] Anyone Know What The Models Were In This NIST Paper?

[John C. Westmoreland, P.E.]

Hello,

Does anyone know what Models A, B, C, and D were in this paper?  Or maybe
had a good idea?

http://www.nist.gov/customcf/get_pdf.cfm?pub_id=50196

Thanks!
John Westmoreland