This software was developed at the United States Naval Academy (USNA)by employees of the Federal Government in the course of their officialduties. Pursuant to title 17 Section 105 of the United States Codethis software is not subject to copyright protection and is in thepublic domain. It is an experimental system. USNA assumes noresponsibility whatsoever for its use by other parties, and makes noguarantees, expressed or implied, about its quality, reliability, orany other characteristic. We would appreciate acknowledgement if thesoftware is used. This software can be redistributed and/or modifiedfreely provided that any derivative works bear some notice that theyare derived from it, and any modified versions bear some notice thatthey have been modified.