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Retreived July 18, 2005 from [4]

Image is from a NASA server, by a NASA employee, making them public domain, not an attribution license as the following information from the page claims:

Images created by Robert S. Mallozzi using Maya, Composer, POV-Ray, Gimp, and xv. These images may be used freely with appropriate credit. Please use the credit line "Robert S. Mallozzi, University of Alabama in Huntsville, and NASA Marshall Space Flight Center" . This may be abbreviated as "Robert S. Mallozzi, UAH/NASA MSFC".