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0001 This code comes from the paper AIAA 2006-6753 [0]. Both the paper and the code
0002 can be downloaded from <http://www.celestrak.com/publications/AIAA/2006-6753/>.
0003 
0004 [0]: "Revisiting Spacetrack Report #3" by Vallado, David A., Paul Crawford,
0005 Richard Hujsak, and T.S. Kelso